That crab is a Porcelain Crab, just like the clown they host in anemones and he will find his way back every time you move him. Like the other posters said your best bet is another anem.
well heres where the story gets really ugly.. thing was i had 2 anemones in the tank. in the beginning the crab wasnt interested in either, then i put the rbta and my two clowns in a container with holes drilled in it and let that hang out in the top of the tank. a day later the bigger clown was hosting the rbta and not letting the other in. I figured it wasnt too big of a deal so i put the rbta back to his spot under some LR and i woke up the next morning to see the crab and clown fighting(well mostly the clown trying to attack the crab). today i get home to find my LTA is gone and part of it is stuck to my mp10...so i guess the answer to the question i asked was 1 day till it got ugly lol. I guess ill get a carpet this weekend @ max reefs back to reef sale