i'm thinking a lesser aggressive sunfish, trained to eat flakes/pellets would work. My Pickerel is an extremely fast eater, he nails the feeders almost as soon as they hit the water. A trick would be to feed the sunfish its flakes/pellets, then drop the feeders in. I have not done this yet, but really think it will work. As far as bullying, as long as the sunnies have each other to bully, I think the Pickerel will be fine. I'll let you guys know how this works, and post pics