There is also 1 PigNose Turtle. the key to this kind of setup is to have a ready hospital tank with good filtration and heater for the fist to recover quickly. The community have controlled overcrowding so that no one fish can be ganged up by the bigger and more agressive ones and there must be a really big fish that will put the tank in order so that none of the viejas can be the dominant in the tank. It helps to have target fish in the tank which distracts them from each other. And most important, attention should be given to the tank always to monitor if any are wounded because of the aggression in the tank that is required to be transferred to the hospital tank.