Planted Tank Guru
Join Date: Apr 2011
Location: Hamilton, Ontario, Canada
Under a pH of 7, ammonia picks up free hydrogen atoms to become ammonium, and become essentially harmless as it's more stable. Bacteria in your filter can still eat ammonium no problem and the cycle will continue. As you approach a pH of 5, there is no traces of ammonia and only ammonium.
Since you mentioned your pH is low, that could be part of it. The other is, some things can just live in bad conditions.
20g platy, , 2 x 10g shrimp, 3 x 20g shrimp, 7.5g shrimp and 1 great dane/mastiff puppy.
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