Best products from r/Goldfish
We found 87 comments on r/Goldfish discussing the most recommended products. We ran sentiment analysis on each of these comments to determine how redditors feel about different products. We found 100 products and ranked them based on the amount of positive reactions they received. Here are the top 20.
1. API FRESHWATER MASTER TEST KIT 800-Test Freshwater Aquarium Water Master Test Kit
- Contains one (1) API FRESHWATER MASTER TEST KIT 800-Test Freshwater Aquarium Water Master Test Kit, including 7 bottles of testing solutions, 1 color card and 4 glass tubes with cap
- Helps monitor water quality and prevent invisible water problems that can be harmful to fish and cause fish loss
- Accurately monitors 5 most vital water parameters levels in freshwater aquariums: pH, high range pH, ammonia, nitrite, nitrate
- Designed for use in freshwater aquariums only
- Use for weekly monitoring and when water or fish problems appear
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2. ALEKO G2950 Submersible Fountain Stream Pond Waterfall Aquarium Statuary Multi Function Pump
Our submersible water pump keeps water flowing anywhere at a speed of 210 gallons per hourUse it to circulate water in small ponds or streams, or to cycle water through aquariums, fountains, or waterfallsTechnical specifications: 110V AC, 60Hz, 17WPump discharge diameter 1/2 inch, can pump water up ...
3. Betterdecor-10 Stalks of 18 Inches Spiral Lucky Bamboo, Exclusive Design By Betterdecor
- Nova 4 Tier Portable Greenhouse protects plants and seedlings from elements of weather and climate. Ideal for starting seedlings, protecting young plants or to get a head start or extend the plant growing season. Enjoy fresh, healthy flowers and vegetables all year round.
- 【Sturdy Construction】 The main shelves use high quality metal with powder coated, heavy-duty bearing net on each layer is strong enough to hold more seed trays, pots and plants growth light. Greenhouses are lightweight yet sturdy enough to ensure long-lasting use.
- 【Unique Design】Designed with zippered roll-up door for easy access and screened ventilation for optimum air circulation. Comes with PE cloth and non-woven fabric cover to accommodate different needs in various weather conditions. Giving your patios, balconies, decks and gardens a touch of green.
- 【Portable and Easy to Assemble】 Easy to setup and break down. No tools are required for assembly. An assembly instruction sheet is included in the package for your reference. Folds up easily into a compact storage bag for transport. Move or store when the seasons change.
- 【 Product Dimensions】27.25"(l) X 19"(w) x 63"(h); weight:10.16 lbs; It's great for use on patios, balconies, decks and gardens. A greenhouse makes gardening more enjoyable, as it's much easier to grow and tend to your plants. 100% Sadisfaction Gurantee,feel free to contact us if products arrived damaged or incomplete.
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4. Ioffersuper 4 Pcs Grid Divider Tray Egg Crate Louvre Aquarium Fish Tank Bottom Isolation,Mix
Made of food-grade plastic material, environmental protection won't affect water quality.This item can cropped and free splice combinationEffectively separate the fish and avoid bites each other.Size: 30cmx15cm/11.8"*5.9"Package includes: 2 Pcs fish tank bottom isolate
6. Best Choice Products External Fish Tank Pump Canister and Filtration System for Aquarium w/ 5 Stage Filter-Green
- Not only does it fits ALL aquarium tanks, our external canister works great for marine reef aquariums such as saltwater coral, reef, and fish tanks
- Purchase our canister for your aquariums to increase oxygen and wave movements for the most natural ecological environment and a cleaner tank
- Watch your fish and coral live more healthy and actively; bring the ocean into your aquarium
- Canister runs quietly and is extremely reliable; 5 stage Multi-Layers Filtration; Quick release taps for easy cleaning
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7. Sunsun HW-304B 525 GPH 5-Stage External Canister Filter with 9-watt UV Sterilizer
- Good for up to 150 gallon fish tanks
- Dimension: 11" L X 11" W X 17" H
- Flow rate: 525 GPH (2000L/hr)
- Pump Power: 55W
- Built in 9 Watt UV sterilizer for controlling algae spores/bacteria and promoting clear water
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8. Hikari Saki Fancy Goldfish Fish Food for Premium Grade or Fancy Goldfish, 7 oz. (200g)
- 1. A mounting hole in the middle of one edge to allow for easier bed leveling thanks to Nophead for this suggestion.M
- 2. Larger LED and Resistor pads to allow for 1206 size surface mount components.
- 3. Much larger area to solder the current carrying wire, easily connect ribbon cable (such as with the Mendel90 headbed connection). Also the through holes increased in size.
- 4. The redundant pads on the non-heating element side of the board removed to prevent confusion.
- 5.These are not electrically connected if the board is not plated (plated boards are bad for the reasons outlined by Josef Prusa above).
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9. New Life Spectrum Small Goldfish Formula 1mm Sinking Fresh – 125g
All-natural color-enhancing ingredients for a balanced diet that boosts immune system and enhances the full spectrum of your fish's color.Quality And Performance Driven Products For Your PetTested For Safety And HealthAll natural color enhancing sinking pelletsThis product is manufactured in United ...
10. Hukidoy Artificial Plants Vines Fake Hanging Ivy Decor Plastic Greenery for Wall Indoor Outdoor Hanging Baskets Wedding Garland Decor (Pack of 2)
- Lifelike for fake flowers ivy suitable for outdoor or indoor decoration, Every Season is Spring, artificial ivy adds a touch of nature to your space.
- Artificial ivy leaves are made with high quality plastic material, Uv-resistent and waterproof for outdoor use, perfect decor for patio where the hot weather kills much fresh flowers.
- Total length of hanging ivy is approx 0.8 meter ( 32 inch ), Each leaf size: 1.18 x 1.57 inch. Comes in 2 pcs ivy plants in package. Hanging Basket is not included.
- Artificial vine neither will die nor fades, no need trim and watering for people who have a busy schedule or but want to enjoy the overflowing of greenery in office, conference hall as the tabletop plants or floor plants.
- hang it on the wall, DIY bouquets,home decor,indoor outdoor decoration,garden, office, verandah, Wedding decoration,These adorable plants will be great choice for your pots,vase,containers.
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11. Mini Encyclopedia of Goldfish: Expert Practical Guidance on Keeping Goldfish Plus Detailed Profiles of All the Major Varieties
- BARISTA APPROVED: Channel your inner barista with our pour over coffee dripper and brew the perfect cup of coffee in minutes.
- TASTE: Unlock your coffee's full flavor potential with our pour over glass coffee maker. Hand-brewing your coffee accentuates its intricate flavors for a bold cup of joe.
- REUSABLE: Built with a laser-cut stainless steel mesh filter, our BPA-Free pour over drip coffee maker delivers a cleaner taste and is kinder to the environment.
- CONVENIENT: Espresso-ly crafted with BPA-free, heat-resistant glass and a cool-touch collar for easy handling, our pour over coffee maker set offers practicality and performance.
- GIFT: No matter the occasion, our drip coffee pour over carafe makes a thoughtful gift for the coffee enthusiast in your life. A steaming cup of freshly brewed coffee is the best way to start the day!
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13. SunSun Hw302 265GPH Pro Canister Filter Kit
- HW-302 Pro Filtration Kit, Good for up to 75 gallon aquariums
- Flow rate: 265 GPH (1000L/Hr)
- Dimension: 9" L X 9" W X 15.5" H
- Pro Kit Includes Canister Filter, 3 White Filter Pads and 3 Media Baskets
- Includes 1lb of Premium Filter Carbon, 1lb of Ceramic Rings and 1 Set of Bio Balls
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14. Jmbamboo - 5-stem of 16" Hydra Lotus Lucky Bamboo - Design Jmbamboo
Fung Shui PlantLives directly in waterLotus Lucky Bamboo is a tropical species.foliage decorative plants and giftsfast shipping estimated delivery 1-2 days
15. Sunsun Hw304B 525GPH Pro Canister Filter Kit with 9-watt UV Sterilizer
HW-304B Pro Filtration Kit, Good for up to 150 gallon aquariumsFlow rate: 525 GPH (2000L/Hr)Dimension: 11" L X 11" W X 17" HPro Kit Includes Canister Filter w/9 Watt UV, 4 White Filter Pads, 1 Blue Coarse Pad, 4 Media BasketsIncludes 1lb of Premium Filter Carbon, 1lb of Ceramic Rings and 1 Set of Bi...
16. 25 Foot - Python No Spill Clean and Fill Aquarium Maintenance System
Will not disturb fish or decor during routine aquarium maintenance.Adapts easily to most faucets.Complete ready-to-use system.No buckets, no siphons, no mess, no tank tear downs ever again.
17. Bestway My First Frame Pool 48"x48"x12" Mini Square Kids Wading Swimming Pool
This creates a total thichness of 0,40-0,80mm depending on the size of the poolEasy set up
18. Seachem Prime Fresh and Saltwater Conditioner - Chemical Remover and Detoxifier 500 ml
- POWERFUL TREATMENT: Seachem Prime is a complete and concentrated conditioner for both freshwater and saltwater fish tanks, working hard to remove chlorine and chloramine.
- REMOVER: Seachem Prime immediately and permanently removes chlorine and chloramine, successfully allowing the bio filter to remove ammonia, nitrite, and nitrate while they are detoxified for 48 hours.
- DETOXIFIER: Seachem Prime effectively detoxifies ammonia, nitrite, and heavy metals found in the tap water at typical concentration levels, providing a ideal environment for your betta, tetra, or other fish.
- USE: Use 1 capful (5 mL) of Seachem Prime for each 200 L (50 US gallons) of new or replacement water. For best results, add Seachem Prime to new water first. For exceptionally high chloramine concentrations, a double dose may be used safely. For smaller volumes, use 2 drops per gallon.
- SAFETY: In case of an emergency, the 5x dose of Seachem Prime may be used for both ammonia and nitrite. Use a ½ dose if the water temperature is > 30°C (86°F) and chlorine or ammonia levels are low.
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19. Aqua Clear, Fish Tank Filter, 40 to 70 Gallons, 110v, A615A1
- Aquarium filtration system that offers superior contact time with filter media and energy efficient pump lowers operating costs
- Quick and easy installation; we recommend that you clean aquarium filter every 2 weeks for maximum operation and efficiency
- Provides optimal mechanical; chemical; and biological filtration
- Comes equipped with AquaClear Foam; Activated Carbon Filter and BioMax and Cycle Guard for superior water quality
- Filtration volume is up to 7 times larger than comparable fish tank filters
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20. Omega One Goldfish Pellets, Sinking, 4mm Medium Pellets, 8 oz
- FOR SENSITIVE SYSTEMS: Omega One Goldfish Pellets are formulated specifically for the sensitive goldfish digestive system. They are 100% meal free and contain significantly less starch than other goldfish foods
- COLOR-BOOSTING NUTRITION: Hand-harvested fresh ocean kelp provides critical nutrients and aids in digestion. Natural beta carotenes in salmon provide extreme color enhancement. Rich in Omega 3 & 6 for improved energy and immunity
- KEEP A CLEANER TANK: Our Sinking Goldfish Pellets are naturally insoluble, which reduces water pollution, and they have significantly less starch, which reduces fish waste
- INSTRUCTIONS: Feed 1-3 times daily, using only as much food as fish can consume in two minutes
- GUARANTEED ANALYSIS: Min Crude Protein 35% / Min Crude Fat 10% / Max Crude Fiber 3% / Max Moisture 8.5% / Max Ash 8%
- Packaging may vary
Features:
Ooo, glad you're rescuing them! I've rescued a few goldfish before as well, so hopefully I can help with some advice:
-Add a ton of Seachem Prime, because it detoxifies ammonia, so if it spikes while messing with the tank, they'll be safe. A small bottle is only $5.
-Do one ~50% water change per hour, until params are ok (you need a test kit like this to know the params, if you don't have one, just do at least 4 or 5 water changes to be safe)
-Move them into the new tank
Are there any specific questions you have? Ps I'd love to see pictures of the dudes when you get them!
A 40 gallon will be much better than a 5 gallon. Be sure to put a good filter on it. (I would choose an Aquaclear 70 if your mom isn't bringing you a filter). It will give you a lot more wiggle room since they won't get to be 12 inches overnight! People do budget stands made from cinderblocks all the time, if you're not getting a stand. I'd stick to bare bottom if you are on the budget. It's cheaper, safer, and easier to clean than any substrate would be. You can buy some cheap peel-off paint and paint the outside of the tank black and do something like this and it will look pretty luxe for not a whole lot of cash. (I would skip the live plants and do driftwood myself, since my goldfish seriously chow down on any plant life in the tank.).
For now, I would do daily 50% water changes. Drain half the water with a gravel vac like this. Add your dechlorinator (again, SeaChem Prime is the best choice, especially in a too-small tank). Add in water that is the same temperature. If you absolutely can't do a thermometer, feel the water and make sure you cannot feel ANY difference. Not perfect, but it shouldn't kill your fish. I would still strongly encourage you to buy a water test kit, since you will be doing something called fish-in cycling. The toxic ammonia and nitrite are not immediately visible, but can cause serious damage to your fish. You want your parameters to be 0ppm ammonia, 0ppm nitrite, less than 20ppm nitrate. Yours are not going to be that, and testing your water is the only reliable way to know when to do a water change, and how serious things are. The best of the reasonably priced is API Freshwater Master, which is usually around $20 on Amazon.
Unfortunately, I wish that the practice of giving away goldfish (or any live animals) as prizes was illegal, since I agree that it is absolutely not fair to you to ask you to spend hundreds and hundreds of dollars on a hobby that you didn't intentionally choose and didn't know anything about until someone gave you a life to care for, and it's certainly not fair to the fish to send them home with people who are not prepared for them! I'm glad you are working on providing a better home for your fish.
P.S. I'm always happy to talk about goldfish, so you are welcome to PM me in the future if you have more questions!
Welcome to /r/goldfish! It's so timely that you posted this, there's actually a 'beginner's guide' to goldfish over on /r/aquariums right now!
Since you guys are already set up, the most important aspects that will pertain to you and your fish are how large their tank is, and what your water quality is - meaning how much ammonia, nitrites, and nitrates there are, but water hardness/softness and ph are also important, too. Most people test their water quality with different kinds of kits you can pick up at a pet store. I would say that those two factors will most determine the long term health and happiness of your goldies ^_^
If you already have one of these kits, please post your water parameter info, as that knowledge can be helpful in other being able to give you specific feedback/suggestions.
Other than that, it looks like you guys are on the right track from what I can see in the pictures. Lost of people recommend sand for goldies because they like to forage on the bottom and can get gravel lodged in their throats, so that was a smart move!
p.s. best of luck with your plants... goldies like to tear them up, but I've heard some success stories, too :)
Weelllll...the best setup is the biggest you can afford. The bare minimum for 2 fancies would be a 40 gallon breeder, but the more space you can give them the better. If you live in the US you can get a pretty awesome discount on aquariums up to 75 gallons (varies by store) fairly often when they do "Dollar Per Gallon" sales. Petco does the most frequent DPGs but Petsmart and Pet Supplies Plus also do them. Petsmart sometimes just has heavily discounted sets also. Anyway, $40 is the least it will cost if you buy a new tank, but maybe you can find a great deal for a secondhand tank on a resale site if you prefer that route.
Filter...maybe go with a SunSun as they're quite cheap for their quality. I use this one and while the UV sterilizer is generally unnecessary I guess it might be helpful in an ich outbreak or something. It's actually slightly below the 10xph flow rate for my 55g so I supplement it with a HOB filter that I keep spare media in in case it's ever needed. For media in the canister I have sponges of varying coarseness, generic ceramic rings (for nitrifying bacteria), and Seachem Matrix (for nitrate-consuming bacteria).
The best water tester is the API Freshwater Master Test Kit. It may seem expensive at first glance, but it's actually cheaper over time - AND more accurate than strips. For water changes, since I don't have a faucet that can support a Python auto-changer, I use a pump stuck to the bottom of the bucket to push water up through spare tubing. Saves me the trouble of lifting heavy buckets or trying to gradually scoop the water out.
The best foods are New Life Spectrum, Repashy, Saki-Hikari, and if you need a cheaper option Omega One. You should also supply plenty of leafy greens; the fiber is very good for their digestive tract.
So I've been doing some more googling and there is a TON of literature on goldfish growth hormone but none of this really helps you if said parents aren't in the biological science field and understand what they're reading... and frankly, if they are then they should already understand that goldfish get huge. And the other issue is, unless you have access to the journals, there's not much I can do. You could always see if you can be part of an interlibrary loan program but if not, I'm not finding much being said in the abstracts. Like this one has some interesting information but it doesn't flat out say, you need x sized tank.
the other issue I'm finding is that the actual good literature costs more than most of my text books and aren't really available online. If you look some more, this one has what you're looking for but this format doesn't include those pages. I don't own the book so I can't scan the pages for you either. I've just read through it before. However, a lot of universities can get their hand on it so it may be worth looking up your zip and seeing if there are any local. This is done by the same author but different version and is well loved by breeders. As well as this one but once again, those prices...
If you really have to spring for a book and this one is well liked and pretty cheap but I'm not sure if it satisfies your need for scientific literature.
Just how scientific do you need? There is PLENTY of evidence about how long goldfish can live, stunting, ect ect out there but do they need someone in a white coat telling it to them?
I'm so sorry for your loss :( There are things that you can do to help protect your other fish from getting sick, but I hope you still recognize that you've already been taking extremely good care of your fish -- your little oranda was lucky that you were the one to take him home.
Goldfish are "unnatural" fish that are bred to maintain traits from their egg-shaped bodies to their fancy fins -- even their color is the product of specific breeding. This makes it so that sometimes, their breeding can compromise their health (like what may have happened with your oranda with his puffy wen). To be on the safe side, you might want to try to source your fancies from a respectable breeder (or even just shop around for the best pet store in your area). Goldfish can also be extremely difficult to take care of, mainly because so much about their care is still wrapped in unhealthy traditions and real experts are so few and far between. (I first got my comet from a pet shop that sold me a bowl, no water conditioner and told me he'd only live a month or two.)
This book from the creator of the Goldfish Connection is really helpful. Again, sorry for your loss.
Edit : BlueSanctum had the great idea of doing a garlic treatment for your sick fish, and thinking about it, maybe you should now look into feeding your other Oranda some garlic and/or doing some kind of garlic treatment ? Just in case your first oranda had a parasite or something which may spread to your second fish. In addition to the Koko's site, Goldfish Emergency has a good article on it.
Get yourself a 75 at least. You've got a common and they need 75+, honestly the best tank possible to buy would be a 120. Your guy is easily going to get 12 inches and they like to have friends, who should also be another common goldfish. I've seen these tanks on sell at petsmart before but you also have to add in the cost of the filter and everything needed. It's a pain in the butt. OR you could go a cheaper route and build a pond or buy a swimming pool (https://www.amazon.com/Bestway-First-Square-Wading-Swimming/dp/B00DYVEWX8/ref=sr_1_39?s=toys-and-games&ie=UTF8&qid=1542224851&sr=1-39&keywords=swimming+pool something like this would work). But depending on how cold it's going to get that might not work out best for you, though that last one could easily be set up in the basement and moved out in the summer. Best bet is probably to find another home.
The main problem is likely ammonia poisoning. Even though you have a filter, you don't yet have a "cycle". The others are correct that your current tank is too small, but the fish will die long before it grows and needs more space if you aren't able to keep the ammonia down.
The best product to get is Seachem Prime, and use it at each water change.
For now, yes change 100% of the water - daily - until you know that you have a cycle in place by testing your water with the API Freshwater Master Test Kit.
If this all seems too much to manage for a fish you weren't looking to own in the first place, you could always rehome it via Craigslist or surrender to a pet store. If you decide to keep it, you're in for a fun, rewarding hobby! :D
They look like it might be ich. Have they been puffing their gills out or rubbing on things? Are they darting back and forth? You could check out Goldfish Emergency and see if the symptoms match. Sometimes anti-ich medicine won't work if you don't clean the tank thoroughly enough.
Also, I can tell you that you have too many fish in there. That might be okay for the fantails, but the comets put you over capacity. Goldies also like water between 65-75 degrees Fahrenheit, so if you can try and lower the temperature a bit slowly. Only a degree every few hours.
In addition, are you checking amonia, nitrites, nitrates, and pH? If not, you need to go and get a tester kit. i also strongly reccomend a GH & KH test kit as well as your goldies will be much happier with proper water hardness and if they are sick it will also help them heal more quickly.
I use a UV sterilizer in my tank for a few hours a week. I especially turn it on after cleaning the sides of my tank. My water is crystal clear now and I don’t have to put any chemicals in my water. I actually did go the chemical route at first but it did t help me much. My brother had left the lights on in my tank for 13 days straight when I was out of the country and both brown and green algae plagued my tank for over a year. UV is the way to go for sure. This filter has a built in light and it’s top tier (they come in many sizes, this was just the first one that came up on my search).
https://www.amazon.com/HW-304B-5-Stage-External-Canister-Sterilizer/dp/B008986EQO
It's been awhile, but I'm planning on ordering these plastic plants and curious how they are holding up? Is it easy to keep them clean?
https://smile.amazon.com/Hukidoy-Artificial-Hanging-Plastic-Greenery/dp/B07JDF8F83/ref=redir_mobile_desktop
Do you know if they used strips or test tubes?
I would recommend buying one of These it will give way more accurate results than strips. And it will last like 800 tests, great for if any time something seems off in the tank
You can also do a fish-in cycle since you already have him.
You'll definitely want him in at least a 20 gal tank, although I've started mine in 10 gallons and let them grow out. 20 gal can sometimes be tough on the budget, but be aware he will need one eventually.
You'll want a water testing kit of some sort. This one is probably the gold standard but you can get away with just some lfs test strips, as long as you're testing nitrates, nitrites, and ammonia.
Also, goldfish are social (not to be confused with schooling) so he'll probably want a buddy at some point if he start showing depressive-like symptoms.
Welcome to the hobby! The addiction now begins lol
I've been researching canisters all morning and I think if I go ahead and purchase this one it should work for my tank and it's in my price range right now. Does this look to be ok, the reviews seem good?
I'll probably hold off on purchasing the stand still though, I'd like to get one of the one with storage under that looks like it will run my about $200.
If you have the money to spend I would recommend the Python. It hooks up to your sink so it's just a matter of pulling some levers.
Other wise, ten gallon storage containers + armless rolling chairs work well for me. Dechlorinate in the ten gallon then use one gallon containers to pour the water into the tank. And a siphon is a must!
Might want to give repashy soilent green a shot. It's a gel food you mix yourself with boiling water. It takes a couple of minutes once every two weeks and it's much more nutritional and helps prevent some health issues. A lot of breeders and distributors like Jenny from Solid Gold and Dandy Oranda swear by it. You can get it on Amazon and the powder lasts forever. I've had mine for several months and hardly made a dent in it.
https://www.amazon.com/Repashy-Soilent-Green-All-Sizes/dp/B00GM29YMA
If you don't mind spending the money, you can get a test kit to check your levels of ammonia, nitrates, and nitrites, amongst some other things. I believe the usually recommended one is this one:
https://www.amazon.com/API-FRESHWATER-800-Test-Freshwater-Aquarium/dp/B000255NCI
It's pretty worth it and will last you a decent amount of time. You might have high levels of ammonia without realizing it, even if you follow your local pet store's instructions. And if that's not the case, then at least you've ruled something out.
I have the predecessor to this filter on a 55 gallon with African clawed frogs and a goldfish it works really well. Since you have a slightly larger tank it might be a good idea to add either another canister or an aquaclear HOB. Personally I would add an aquaclear 70 or 110
I recently got an Aquaclear model, seems to work well and can accept alternative media.
This one is rated 40-70 Gal; https://www.amazon.com/AquaClear-70-Power-Filter-Listed/dp/B000260FUW/ref=sr_1_3?ie=UTF8&qid=1506616335&sr=8-3&keywords=aquaclear
Ammonia is one of the most important things to test for. Plus, test strips are notoriously inaccurate. This kit is the thing you need. If you're hell-bent on keeping the test kit you have, at least buy an ammonia test kit. Your ammonia and NitrItes should read 0 ppm. NitrAtes can be present, as long as they are <20 (some people say less <40, but I always err on the side of caution). Did anyone at PetSmart educate you on how to properly cycle a tank? I'm really surprised they sold you a fish with a brand-new tank...That's pretty messed up of them. But I'm not surprised. They might have sold you a sick fish, too, that is just now showing signs of illness with the extra stress of being put into a new tank. Super sorry I can't be of any more help at this point! Could you try posting your photo of the fish again?
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***Edit: I got the photo to load. It's definitely not ich. That looks like some fungus...Maybe? It's so hard to tell. He looks really sick, whatever it is. It did not just start all of a sudden-I think they sold you a very sick fish. If it dies, do yourself a favor and do not ever buy anything at that PetSmart again. I'm so sorry. I hope he pulls through.
Test strips are not very accurate. You should get this
What kind of filter do you have on it?
Also just because all your fish look healthy, doesn't mean they are
Its not too hard if you get something like this: https://www.amazon.ca/Python-25NS-25-Feet-Aquarium-Maintenance/dp/B000255NXC
It takes less than half an hour to change 50% of my 75 gallons, and most of it is me sitting on my couch watching TV trying not to forget I have it running.
Hoooo boy. Okay so here's the deal. You have waaaaaaaaaaaaaay too much fish for your tank. The minimum recommended size for one goldfish is about 75 liters, and it increases as you add more goldfish. For two goldfish, you'd need 113-151 liters (depends who you ask). And your filter needs to be moving 10x the capacity of the tank per hour. So for example, if you had a 75 liter tank, you'd need a filter that's moving 750 liters per hour. Anything less than that is going to cause problems.
First things first, though. Your water quality is not good. I can almost 100% guarantee it. Your tank is not large enough for your fish, and you don't have a filter, so your water is going to quickly become lethal. This isn't a scare tactic. It's the truth. This is why your new fish died. It likely already had a weakened immune system from the stress of moving, and the poor water quality quickly overwhelmed it. Goldfish are some of the messiest fish out there, thus they need a lot of water and a lot of filtration, otherwise they will literally die from breathing their own toxic water.
Don't use chemicals to regulate your water quality. You need to get a water test kit and start learning how to keep track of your water parameters yourself. As of right now (is in like, today), you should be testing your water every day, and changing 50% of it every day, and make sure you're using a water conditioner like this one every time you change the water, since tap water isn't safe for goldfish.
So, to summarize, go get at least a 75 liter tank (but larger is always better with goldfish), get at a minimum a filter that moves 750 liters per hour, get a water test kit (drip test, strips are not reliable), and get a water conditioner. Do a 50% water change every day, adding water conditioner to the new water before adding it to the tank. This stuff is all going to be expensive. But once you have it, the cost of keeping the fish is quite low. It's a small price to pay for the health and wellbeing of living, feeling animals.
If you have more questions, be sure to ask.
I do a similar water change with the Python water change system (got it here https://amzn.com/B000255NXC) and always mix in the water conditioner as it fills, so far no issues. Filling with pre-declorinated water is of course the safest, but really can't beat the efficiency of straight from faucet for large tanks.
Amazon, I found these and used plant weights and black thermoplastic I already had to make a base so they’d sink. I used half of one of the plants for each side of my aquarium. They came with the stems attached to a plastic coated wire so I just popped them off and pieced them out.
I've had a Sunsun (this one) on one of my tanks for almost two years now and have never had any issues with it.
https://www.amazon.com/API-FRESHWATER-800-Test-Freshwater-Aquarium/dp/B000255NCI
U can find seachem prime and the test kit in pet stores.
This is the kit everyone is mentioning- correct?
it looks like nitrate poisoning. are you sure you've been shaking your nitrate test enough? the instructions say 30 sec on the second bottle and 60 sec on the mixed solutions IIRC, and they really mean it. you can get much lower readings if this isn't done properly.
that said, i also do not think the answer in this case is to change so much water at once, because it will shock the little guy even more. you are going to want to change a lot of your water, but gradually over the course of the day.
i would also suggest adding a little airstone or two to help him breathe a little bit easier while you try to deal with this.
it also bears asking: are you using any sort of water conditioner? chlorine in tap water can kill the good bacteria that lives in your filter. tho that wouldn't lead to excessive nitrates, it can lead to big big problems fairly quickly, so if you're not already doing it (and sorry for the lecture if you are!), i would suggest picking up a bottle of Seachem Prime asap. use it every time you change any water!
Lots of opportunities here:
Finally, do you treat the fresh water you use for water changes with a dechlorinator? If not, you need to get your hands on some. The chlorine that is added to municipal water supplies can kill the beneficial bacteria in your tank and lead to dangerous ammonia and/or nitrite spikes.