That makes me feel a lot better, the thought of that slamming the bottom glass or fish is spooky. I think scuffs aren't a big deal with cichlids until it elevates beyond a missing scale here and there. As long as everyone is eating and avoiding infection I don't think it's necessary to intervene. Fish will always test one another in my experience, once one comes out on top of the food chain the rest can fill in nicely. I keep more peaceful cichlids though, and even my red severum has been beating up everyone who gets too close.