Are these a hitchhiker or a part of this corral

Are these tentacles sweepers or some sort of pest? There are multiple of them coming from this coral. They don't seem to move off of it however and they've been there since I acquired it.
 
Looks like tentacles of micro brittle stars Good hitchhiker
They don't seem to move off the piece though, would this be typical for it to stay there? Sometimes I see 4 or so of them. I suppose this could indicate a star?
 
They will move around once the lights go out
hmm... they've not left this coral though.. been there for over a week, after looking them up they don't quite look the same as the micro. They do sweep, maybe I can get a video of them sweeping.
 
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