I had one in a mixed reef tank with a cleaner shrimp for a year or so. I had not fed the tank due to a week long vacation. When I returned and fed the fish the shrimp swam up to my hand to grab food and was quickly bit in half by the trigger. As crazy as it sounds, it seemed like the trigger realized his mistake and didn't finish eating the shrimp. I had soft corals only and it did not bother any. He did knock over or push around some smaller rocks and frags in his search for food.