evenningstar
Aquarium Advice Newbie
Well, you should have way less fish. I would do 2 50% PWC a day. What are the test results?
I had 7 tetras, 4 danios, 2 angels, 1 betta, 1 julii cori and snails. It wasn't too many fish for my 20 gal tall. I didn't have any problems. Glowfish are small schooling fish like tetras I dont think there would be any problem with 15 of them in a 20........