Hi, fluff I have two false percs also acting that way, one is bullying the other. I have them QT
right now. I bought them three weeks ago. However, don't worry because that's normal. That means a pecking order is established. They'll pair up in time when they get bigger. The larger fish, which will be the female of the pair will continue to bully the smaller fish, which will be the male. However, she shouldn't become overly aggressive and kill him, at least in most cases. As I learned, I wouldn't add any more percs to the tank because then you'll have aggression problems. As a rule, it's best to either keep a single clownfish or a pair of clowns of the same species per tank. Good luck!