i added an emerald crab to my tank about 3 weeks ago. Last night i noticed he was spending a lot of time near my Lords Acan. I happened to look over and see it dig his claw into the coral and rip a piece off that he promptly shoved into his mouth. I spent the next two hours trying to catch it so i could remove it from the tank but its still in there, dam rocks! i thought emerald crabs were completely reef safe and a welcome addition to a clean up crew?? Is there any reason someone may know about as to why it would eat my acan? Has anyone else had this issue, and lastly any tricks to getting him out?