The perch is like a little puppy dog, if there is a scuffle (rare) he will just swim away from it slowly. I've never seen it show any agression to any of the other fish. He just kind of swims around looking dopey and stares at you no matter where you are. Its a great fish to have in a monster community.
and yes, in person it looks MASSIVE. (he gives us a bath every time we feed them)