Hi scotts, emerald crabs shouldnt eat your bristle worms as far as I know.
What do you need cleaned up? Different critters are good for different things.
P.S. I'm in Simi and belong to a reef club based in Ventura. We usually meet in Camarillo. If youre interested in checkin it out, let me know. Its free to join and its a great resource for anything aquarium related.