What is this?

[Sarahbell430]

about 1/4 inch long ...has tentacles coming out of lots of tiny stalks...gowing out of the live rock

 

[tinfoilsoldier]

Your pictures are pretty bad, but I guess Kenya tree frag, that was ripped off the plug but grew back.

 

[Ztous]

Kinda looks like a Xenia stalk to me but without more picture I don't think you can really tell.

 

[mcgyvr]

yeah a shot from a different angle and a little more focused would be nice..
(and good on you for including a shot without the blue channel on)..

maybe a small chunk of xenia
maybe colonial hydroids
https://www.lionfishlair.com/hitchhikers-guide/