Got my first coral and found a critter (Nudibranch?) stuck to the glass right after adding it to my tank, any idea what this is?

Fish Fan

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@ISpeakForTheSeas

Not sure from that pic, but the "arms" look sort of like a serpent star to me. Typically, these animals (which are not true sea stars) have five arms, but they can break them off, and I think they can regrow them. So you may have one of these who has lost an arm or three.

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Looks like some sort of echinoderm to me. I love the little guys. I have some that hang out in little crevices and stick two or three arms out into the water column when the LED sun goes down.
 
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