He is a large tiger barb the size of a half dollar and his belly does look unusually large compared to the other. I knew the tank would need to re-cycle when I cleaned it. It is not mine. It is my inlaws. It was disgusting and some of their fish died. The filter was completely clogged and doing nothing so I cleaned the whole things after studying up. I wanted to wait and let the tank cycle for at least a month before they got new fish but they could not wait. They bought the two large barbs first which all did fine for a week. Then they bought six little tiger barbs (one already died), a clown loach that now has ich, along with a rainbow shark. Its been a few days and toady the little tiger barb died, the clown and another little tiger barb show ich, and the large tiger barbs are acting strange, one tail up, the other swimming around a lot more than usual.