Can't tell for sure, but I'm assuming it has no shell from the pic. Looks like some sort of nudibranch, many of which are either harmful to corals or hard to keep.
HTH,
Mariner
Don, I agree it's a Scutus, but the species from here, sometimes called a sunburts limpet in the trade because it is bright orange, will eat coral polyps.
Yeah, they're in the same family as the Sunburst Limpet (Fissurellidae), which certainly does eat coral polyps. This particular species is supposed to be an algal grazer, though. Here's a link with some good info on them:
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