overcrowding
that's alot of fish, and they are going to get big.
Although fresh is not as bad as salt in that manner, that is still too many fish.
You should probably do weekly 25% wc as of now.
When they start to grow you will have to get rid of some.
What happen when you put too many fish is the levels begin to rise slowly untill they reach a deadly level.
that's when tanks bomb out, and we get asked the question I don't know what I did wrong
Cleaning both filters at the same time make matters worse, by killing off to much bacteria.
When there is to much of a load and not enough bacteria, that is an accident waiting to happen
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