heheh... tall tanks are the worst for multiple reasons, but at any rate, nigers are calm and peaceful, well, as triggers go anyway, while Humu's are mean and nasty. Between the tang and the Humu, it's no wonder whatsoever your poor little redtooth is hiding in his rock all the time,. It would also help to offer it better food with more variety.
Are any of these 3 new in the tank, or have they all been in there for quite awhile with no problems until recently?
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