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It's a nudibranch, eats spirobid worms and is beneficial. Vayssierrea felis, search the forums for those.Definitely not a lettuce nudibranch.
But it does seem like a type of nudibranch though. No telling which kind without a better picture as there are a lot of species and they often have obligate diets so chances are it'll die on its own.
Unless it eats gonis of course

