Perch are great! I have four 6-7" fish in with a sunfish. They let the Sunny push them away from the front of the tank until feeding time...then they are lightning quick and grab the feeders before anything else! I love watching these guys!
Lol. I'm just keeping mine by themselves for now so it'll be cool to see how they adapt to my 75 in a few months. They're sure voracious feeders, mine stuff themselves with bloodworms in no time, can't wait until they're big enough to get feeders