Can someone identify?

[Moro]

If you poke it, it sucks back in SUPER fast, is this aptasia or a anemone

 

[fishywishy]

I think it might just be a fan worm.

 

[Peter Houde]

My guess (and only that) is it's a polychaete worm, e.g.. Bispira. Does it retract into a calcareous tube? Guaranteed it's neither aptasia nor an anemone.

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[OrionN]

It is a Feather duster. Which species is I no possible to tell with that picture. I never try to ID these hitch hikers beyond this level.