Discussion Starter · #1 ·
I just recently set up a malawi fish tank (58gals), now with 16 fish. I noticed that most of them are scratching on the substrate. I added fine coral sand on ordinary aquarium gravel. I read that fine coral sand causes gill irritations on fish. Is that true? All the stats (ph, kh, gh, No2, No3, ammonia) looked ok. Fish seemed happy, anyway.