ID Please?

[umbrellacorp]

Been wondering what this thing is for months.. just now got around to asking. Some kind of aptasia? It pulls it "arms" back into the center sometimes as if its catching food and eating it.
(please ignore cleaner shrimp antenna)

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[thesilence87]

I'm going to guess some sort of filter-feeding nudibranch if it *can* move from one spot to another.

Edit: They can sit in the same place for months at a time if they find a spot they like though.

 

[umbrellacorp]

Ive never seen it move places. All i see it move is its arms


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[jead85]

Hard to tell from picture