Well thats why you should research before adding to tank. If you have a sump banish him to the land down under lol. I tell you what I got a stone crab that reef safe for you lol. Hell that thing is not even tank safe. Good luck with the hermit. Also just a little fyi there is no reef safe crab. Crabs are scavengers and will eat what ever they feel like when ever the feel like it. Not saying all crabs are bad but evey crab could pick at coral. Especially large ones.