We got a baby black P. in October. He used to be fairly active for about the first month, swimming around the tank, agresivaly chasing feeders he looked healthy. For about the last month though, he just hangs out in one corner of the tank and rarely swims around at all. Infact, sometimes he appears to be slightly on his side as if he's having trouble staying ballanced in the water? When feeders are in the tank, he will dart from his corner, take a bite and then go back to his corner of the tank, he just isn't active at all. He's always resting in the bottom back corner of the tank, appearing to be on his side somewhat. The water tests perfect and the tank is kept at 80. His color and everything looks great and his appetite is normal. He almost looks dead at times........just sitting in the corner, you can come back and check on him a few hours later, and he hasn't moved at all. Is this normal behavior? Any suggestions? Thanks!