I have one, two years now, only time he shows aggression is the addition of new fish. He leaves my corals, snails and hermits alone tooo. I also have a bursa trigger and haven't had any problems with him either. And I have a mixed reef with coral banded shrimp, purple reef lobster, snails, hermits and coral. They do eat alot so you should have an oversized skimmer if your going to keep one.