As stated, keep on top of your water parameters, doing PWC's as necessary. While a lot of people will say that auratus are a very aggressive fish, the two I have are definitely not. Some people suggest that raising fish together from juvies will lower their aggression as adults. I believe this to be true, as it seems to be the case in my tank. I have two adult male auratus that are far from being aggressive. My male kenyi rules the tank, and the auratus mind their own business. I guess they're one of those "YMMV" fish.