Reddit mentions of Instant Ocean Aquarium Sea Salt

I used to use 2 throw away Tupperware containers. the shape and size is up to you. i think I used the "Snack" containers. Just make sure your biggest crab can fully submerge in the bowl.

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1 of them you want to fill every 3 days or so with de-chlorinated fresh water. Many of us use "Prime" for this as it gets rid of the things we need to get rid of while also not adding slime coat which is more for fish and can be harmful to the hermits. Product: https://www.amazon.com/dp/B0002568S6/ref=twister_B00ZK06JG4?_encoding=UTF8&psc=1 (this will probably last you a few years - you only need a drop of it)

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The other pool you want to use Instant Ocean and Prime with tap water. Since you are probably only needing a small amount, what many of us have done is create 1 gallon at a time and store it in a milk jug. It's like 1/2 cup of Instant Ocean in a gallon of water to get the right mix. https://www.amazon.com/Instant-Ocean-Aquarium-Sea-Salt/dp/B00NQH210G/ref=sr_1_2_sspa?s=pet-supplies&ie=UTF8&qid=1536593406&sr=1-2-spons&keywords=Instant+ocean&psc=1&smid=A2IH97EK742889

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Here is a picture of my old tank. maybe it'll give you an idea for pool setup and size. https://imgur.com/5ksXE0w | https://imgur.com/lpq8git | https://imgur.com/KlRTTP1

if you want to make the most of it, go for a saltwater setup. order instant-ocean salt ($17 for ten gal)

get some live rock, small anemone or corals, and a couple clownfish or some dwarf seahorses... the ladies will want to come over and spend time just for the tank ;)

instant-ocean salt: https://www.amazon.com/dp/B00NQH210G/ref=sxts_kp_tr_2?pf_rd_m=ATVPDKIKX0DER

don't forget a $5 hydrometer to keep an eye on salt levels and a $15 surface skimmer. everything else is about the same. If you live in a dorm that is always heated, you won't even need a heater. liveaquaria.com or ebay.com for very interesting saltwater fish and live rocks. It won't run you that much more than a freshwater setup will.

live seahorses: https://www.ebay.com/itm/SALE-DWARF-SEA-HORSE-PAIR-marine-saltwater-fish-aquarium-coral-rock/292786274407

I've left the hottest chicks on campus staring at my tank going "OH MY GOD ITS NEMO!" with child-like wonder like they've never seen a saltwater tank in someones room before... because they probably actually never have.