Don't drain it yet. If you did a 75% water change and your ammonia didn't decrease, it seems to me like it's one of two problems 1. Your test is wrong. This could be either just a crappy test kit, you not following the directions, or an old or expired test. 2. There's ammonia in your tap water. You should test your tap water and see what levels of ammonia, nitrite and nitrate you're starting out with. There's almost 4 ppm of ammonia in my tap water, so I let all my water sit out overnight with Prime in it before I do a water change. This gives the Prime time to do whatever it does to "neutralize" the ammonia. Have you tested your tap water?
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55 gallon - 6 Zebra Danios, 6 Cardinal Tetras, 2 platys, 3 Clown Loaches, Angelfish, Clown Pleco, Albino Bristlenose Pleco, 2 Peacock Gudgeons
5.5 gallon - divided, 2 Bettas
Slightly less than 4 pound chihuahua |