If anyone else on here watches river wonders on animal planet you might have seen the piranha episode? But anyways it got me wanting some p's. So I was thinking some rbps how many can fit in here? And can they be mixed with anything... Because I'm love pbass and that's what this tank has in it right now as a growout. Could these two work together at all? Or would the rbps destroy the pbass? Or LOL I'm a newbie to piranhas so give me everything nessesecary.