Weird tentacles growing out of a rock

[Eugene233]

Hey guys so i have had this leather attached to a rock and i was looking in my tank today and realized there are tentacles growing out of the hole of this rock, i dont think they are bristle worms but im not sure. If anyone can help me identify what this is and if it is dangerous to my corals i would be in much appreciation of any help thanks guys

 

[PicassoClown04]

Hi! lookin like a micro brittle star! Do they have quite a bit of texture? Do they only come out during feeding? If it is a star, they are good guys and harmless in your reef

 

[Jman76]

Looks kinda like Brittle Star

 

[Eugene233]

It does seem it have texture, thank you guys i do appreciate the help.

 

[JJ Ligs]

I have 100's of them in one of my tanks and they are micro bristle star legs

 

[92Miata]

Its either a brittle star - if it moves around - or its a type of spaghetti worm - if it doesn't. My bet is on the worm. ( Terebellidae )

They're fine

https://ocean.si.edu/sites/default/files/Terebellidae-Unidentified-combined.jpeg