I think ours has self esteem issues also, and therefore is lashing out at everyone else. We got him as a replacement shrimp after our hawks ate our cleaner and peppermint shrimps and we wanted one they would not harass. We have since regretted the decision, but have been unable to get him out of our 210g reef. We have a really large pistol shrimp (2+ inches) with anger management issues, who we would like to vacate also. These are mistakes we would not make again. Such is life in our hobby.... Mike (& Kristy)