Today we got a 8" red bellied piranha and so far he has been very inactive. The tank is plenty big and we have a large peice of driftwood in the tank. The fish has not moved from behind the driftwood yet. Now I understand that the fish is stressed, but shouldnt he be a little active. I have taken all precautions before and after I placed him in the tank. I guess what I am asking is whether or not we should keep the driftwood in there. If I take it out there will be more room and he will kind of be forced to be active. However if I leave the wood in there he has a hiding place. What do you guys reccomend.