Exactly right.Redfin and grass pickerel; marbled bullheads, would be a good size for your tank or smaller. If you want to do something really interesting skip fish all together and get some tentacled snakes instead.
Or you can get a black crappie and few big American bullfrogs, bullfrogs will lunge for anything they can cram in their mouth (such as flying birds), and can be trained to be handfed.