Looks like a teddy bear crab. They are supposed to be harmless to the reef tank. Check out reefscavengers.com they have a description of them and a picture.
No, this one is in genus Cymo. All species in this genus are obligate symbionts of acroporid corals. They are reported to eat primarily mucus and occasionally a few polyps but help keep the corals in good health through their clean up activities and by chasing off would-be coral predators.
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