i can tell you from personal experience that anemonies will move around your tank if they are not happy with where they are located. improper lighting could cause this, or poor water conditions, or lack of a decent food source. they will sting anything that they touch. while out of town once, my girlfriend broke 2 of 6 powercompact bulbs i was running on my tank at the time. due to sudden loss of light, my condy started moving around the tank and ended up killing 2 corals, and almost a 3rd that's slowly growing back.