worms ID not bristle

[C0rp]

This pic is horrible I know, my camera zoom is broken so had to use phone:

I have several of these worms in my tank..the one in this pic is barely over 1/4 inch long. My tank is 4 months old and was started with dry rock. It has brislteworms and hair worms purchased from IPSF, along with a sample of their live sand activator. These small clear/white worms are fast and and have dark heads. They are very aware of movement outside tank and will retreat into sand or rock upon detection. I can find them all over the tank. Anybody seen these before? I started w dry rock to avoid nasty worms and now I'm afraid I've got a thousand eonone fulgida worms or something! I havnt seen any big ones yet, and can't ID them on chucks site either. They have a "diamond like" marking on each segment of their body.

 

[Clonefarmer]

Lysaretid worm or small Eunicid worm maybe?

 

[C0rp]

It seems unlikely that I would have either of these worms in mass as I do...at least I sure hope not. Starting with all dry rock I don't know how either one of those beasts would be in my tank reproducing already? I've not witnessed any adults either. I guess I need to get some better pics so some of the experts can take a shot at what these are.

 

[C0rp]

I believe I have this worm tagged, this pic looks exactly like what I'm seeing. They are Dorvilleidae worms, and from what I gather beneficial to my DSB!