black belly

What are your water paramters, how long has the tank been set up, what else is in the tank, what size tank?
 
I have 20 in a 10 gallon for now. (will move them to the 20 soon) No other fish. Ammonia/nitrites are 0, nitrates <5. They are eating brine shrimp, flakes and blood worms.

Tank has been up several months.
 
It could be stress from overcrowding, as long as it is acting ok, Id keep an eye on it and the others.. Dont think it is a disease.
 
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