Thanks tauaru. I know we should have done some research before getting into the aquarium business (boyfriend set it up and I thought he knew what he was doing; I ended up taking care of it). I've been told by others that having three different kinds of schooling fish is a problem. The serpae that I ...

I have a 5-gallon tank with one large blackskirt and a lemon. There was a medium-size serpae in there until three days ago when I noticed the blackskirt had nipped off half his tail, so I moved the serpae to a spare 2-gallon (he's all alone). There was also a small albino cat, but I thought the ...