Bristle or Eunicid Worm?!

[corahhhhline]

Or should I say worms?!?! I really don't know if it's the same worm coming out of multiple places from the rock, or if it's multiple worms. Either way, I'm told by my LFS guy that bristles are good for the tank, and Eunicids are bad for the tank. S***, I can't tell the difference by looking at it. It doesn't appear to have a head like the pics that I see of Eunicids, but how do you tell? And...do I need to get rid of it on either account?

In this pic, you see it coming out near the hole in the middle of the rock
http://bluffmedia.s3.amazonaws.com/jeff/IMG_2820.JPG

In the next couple shots, it's coming out from the lower hole, just to the left of my pistol shrimp's little palace. I snapped a couple shots in a row. You can see how he stretches out and reaches for food....
http://bluffmedia.s3.amazonaws.com/jeff/IMG_2830.JPG
http://bluffmedia.s3.amazonaws.com/jeff/IMG_2832.JPG

The thing kinda freaks me out!

Thoughts?

[Ticul]

Looks like a bristle to me.
Good guys for your tank.
Just my vote though...

[corahhhhline]

Thanks Ticul. Does anybody else have a differing opinion on bristle worms? Am I freaked out over nothing?

[ravenmore]

bristle worms - very common and 99.999999999999% of the time harmless.

[C0rp]

Good for tank. I BOUGHT them for my tank, as I started with dry rock. =)

[corahhhhline]

Thank you all for the feedback. I appreciate it.