Can Anyone Identify this?

[SeanJet]

Okay, so while inspecting my rock I am seeing this object that to me looks like an old coral skeleton, the problem is I think it has grown. Now I am new to this whole thing but a skeleton, in my opinion should never grow. So clearly by this point I have deduced that it is something living.

Its in the circle(I have terrible paint skills, need to reinstall gimp)

[twisted]

its real hard to see but i think it looks like a feather duster....go to xtalreef and that site has a list of pics of good and bad thingys.