Definitely a nudibranch. Without a better pic I can't really say what kind. Nudibranchs are obligate eaters (only eat one thing), so unless you have that particular food in your tank it likely won't survive. And if its prefered food IS in your tank, you probably don't want him eating it because you probably paid good money for it. It's a bummer, nudibranchs are my favorite sea critter but they're damn near impossible to keep.
Can you snap a better pic and give me an approximate size? I'll see if I can figure out exactly what it is.
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