What are these? Pest identification.

[Rustylugnuts]

I've posted this in my build thread and I have no ideas what they are.
I'm currently cooking this rock and these lil guys have spread in the dark.
Anybody have experience with these critters? What are they and how do you remove them?

Here they are dead center in this pic.

Another angle

I haven't been able to get a good shot when submerged. Before being disturbed it looks like cross b/w a small anemone and a feather duster that extends out of the tubes.

 

[erichatesmice]

Could it be hydroids?

http://www.reefcentral.com/forums/showthread.php?s=&threadid=1455890&highlight=hydroid <br>
http://www.afsc.noaa.gov/groundfish/HAPC/Hydroids_synopsis.htm

 

[Rustylugnuts]

The second picture looks kinda like what I have when they're extended. With mine the head or polyp is very thin and wispy. I'll set this rock in the DT and try to get a better picture if I can.