Reddit mentions of Seachem Flourish Potassium 500ml

Things you'll need:

Filter

Heater

You'll need this for the filter

Substrate

lamp i bought mine at a supercenter for 7.99; this link is to let you know what it looks like

light

I personally use everything on this list; they're cheap and reliable. To maintain the sponge filter all you have to do is rinse it in a bucket filled with tank water, after a water change for example, every 2 weeks.

Go to r/plantedtank for info on plants, but i will give you some quick tips

1. Plants are living organisms; they need nutrients just as we humans need nutrients. They definitely get malnurish and it shows. To prevent malnourishment aka nutrient deficiency you need to dose nutrients. I reccomend seachem flousrish, seachem excel, and seachem potassium. If you only want like 1 or 2 plants then you might be able to get away with only dosing flourish, but if you want a good amount of plants you will eventually need every nutrient including nitrogen(depending on how many fish you have), iron, and phosphorus. If you don't dose nutrients your plants may die and you may also get an algae farm; once algae gets established it can be hard to remove so it's better to prevent it. You could also dose co2, but that's later on; you'll need experience with plants first.
   
   
2. In the planted tank community fish tanks are distinguished by low tech setups and high tech setups. I'm not gonna explain the difference, look it up yourself, but you will start out with a low tech setup. Since you'll have a low tech setup look up low tech plants on google or whatever search engine you use. The most common are moss, wisteria, anubias and so on.
   
   This is everything i can think of on the fly, but do a lot of research on your own. Having a planted tank isn't as easy as just plopping in some plants and watch as they flourish.

I find it odd that your showing 0 Nitrate, but you're dosing flourish comprehensive. Anyway, two things that I noticed 1: your photo period is quite long, especially with you only dosing excel as a source of Co2. Your plants could possibly be getting "burnt" by the long photo period. 2: pin holes in leaves are typically a sign of either low potassium and/or low magnesium. This is why I reccomend dry ferts. You see when you're dosing flourish comprehensive you're giving your tank a cookie cutter dose of ferts. It may contain components that your tank doesn't need; while lacking others. Potassium deficiency is common with dosing flourish comprehensive. You can find great dry ferts at http://greenleafaquariums.com . It's also much cheaper to use dry ferts. If you choose not to go the dry ferts route, seachem makes liquid potassium https://www.amazon.com/gp/aw/d/B0002APILO/ref=mp_s_a_1_1?ie=UTF8&qid=1467512244&sr=8-1&pi=SY200_QL40&keywords=seachem+potassium&dpPl=1&dpID=41kRWrm1WzL&ref=plSrch Comparing prices, quantity, and efficiency I'd highly recommend going with dry ferts. If I can help you in any other way, please let me know.

Look into buying some Seachem fluorish, it's got just about everything you need to fertilize your tank, except for the potassium. I would start with that to see if that fixes the issue. If new leaves start coming in damaged, or old leaves continue to brown, Seachem also makes a potassium supplement that you can dose in addition to the fluorish. I'd also recommend adding some source of bioavailable carbon to your tank, fluorish excel would be good for your needs. As long as you follow the dosing directions your fish will be fine.

You also say that your sister does changes every two weeks then cleans the glass by wiping the algae away. What percentage of the water would you say she changes? Also, got any pictures of the tank?