Worms!

[Lolas_boy]

I have spotted these slim, white wirms crawling around on my rock. They are about 1-1/2 inches long, have slight brown tips to them, and seem to be able to stretch to 2-3 inches though. They are not rooted to the spot. I have only seen 2 so far. No pics, sorry. Too small for my camera.

 

[LeslieH]

Sorry, without a picture that description is much too vague to narrow it down to a phylum let alone a species....

 

[PerezAF01]

Probably harmless. I have a bunch on my rock and I have been keeping a close eye on mine. They look almost like white hairs sticking out from my rock. They only come out at night or during feeding time.

 

[Reefguy51]

Bristle worms I would guess. They can be a problem if left unchecked for to long. You can get traps to catch them or there are natural preditors such as crabs to keep them from getting out control.

 

[Reefer577]

Japanese wrasse or christmas wrasse are good to keep bristle worms in check. I don't mind bristle worms but I don't like having a whole tank full of them either. ;p