I picked up a new tat on a trade. he is about 8" and eating pellets, shrimp, just about anything.. Question is since they like to school and i cannot get my hands on more right now, what else would make a good addition? Something that is easy to get and wont matter if he shanks them. With my armatus i have a large 6" silver dollar that works good, he has nailed him a few times but it triggers him to eat very aggressive. Would something else be better with the tat to dither?