I lost a few fish and initially thought i was doing something wrong. I added some hermit crabs and they are acting strange. All of the crabs gather together in the very front corner of the tank and then at night they scatter for food. My experience with them is they usually move around all day but in this tank their behavior is different and They seem to die quickly. I then heard that dreaded snapping sound. There he was on top of a torch hammering the base of the coral. So I need to get him out before he kills the rest of my fish. I’ll try and catch and return him to the legs if they’ll have him.