I wouldn't think so, if the tank is big enough, i know of some guys who house 2 dif clowns in same tank. Also, im not sure what else you've got in there but watch it with those nano's, they max out the bioload quick! Girlfriend has a 10 gal with a small half black, true perc, cleaner shrimp, 2 hermits and snails and she's just about maxed.