I had a lot of luck with peppermint shrimp - cleaned everything up within a week and haven't bothered any of my corals or critters (that I have noticed). They even spawned and provided grubbies for other tank inhabitants. I thought nudibrachs would be a really interesting addition to my tank and had considered them but I was told that certain nudibrachs would do the job but since they can be specific in their diet they would probably starve once they have helped you with your problem. I guess the best bet would be to have a back up plan or "retirement" home in case this turned out to be true.
