I have one 6" Pacu (which I thought was a Red) and two 6" Red's hangin out in a 55g crib. I plan on building a 175g tank soon. Does the Pacu ( being related to the Red Belly) have a chance of surviving? It's schooling with them right now and his playful attitude is really a pain in the ass. He already ate the fins off my 16" Shark which is now dead. Are they gonna get along?