Sorry if this has been asked before, but didn't see anything here so... I have two clowns that I got less than two weeks apart. They used to swim all over my tank together and were always super nice. About 4 mknths ago I got a medium sized RBTA and one clown took tonit immediately. That clown then almost doubled the size of the other in the past four months and over the past month and a half has been "mean" to thd other smaller clown. That clown won't let the other near the RBTA and now just hangs with my two tangs. No aggression during feeding. And no real aggressions towards any other fish in the tank. Any ideas?