I think that may be a Berghia Nudibranch that dines exclusively on Aiptasia. Just a guess?
They are generally brown after they have eaten some aiptasia and white when they haven't Chris
He's flushed now for sure. Others have indicated it is possibly a polyp eating (zoa-eating) nudibranch.
Although I haven't seen anything missing from my zoas, I have an orange funghia that now has part of its skeletal structure showing. Looks like something was munching on it.
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