Hi I just introduced my two red bellied Piranhasabout 4 inches and 20-23cm long snowflake moray eel with my already existing full grown two walking catfishs. After I introduced them my W. Catfishs didn't bother my eel but it was disturbing my 2 Piranhas. I did put some mud and sand to the aquarium with was already filled with fancy aquarium stones for my track eel to burrow. I added some plants also. But last day a few hours after adding my fish I could see the water became completely muddy and all plants were uprooted, therefore I changed most of the water today but I found my piranhas always hiding in the caves and also disturbed by my catfishs although not so often. But my eel isn't disturbed by other fishes. So will they all go together?