Type of worm???

[Drvillen]

I only saw this thing once when it came to from under the rock and sand. About 2 weeks ago I saw it and not since. No photo tank was dark, the under side is beige the top is dark and it looked more like a millipede, lots of beige "legs". If I need to remove it I will, it extended out of the substrate about 2 inches, when I shined the flashlight, it went away with a mysis shrimp and I have not seen it since. Any help in photo searches would be great.
James

 

[FishyReef]

Sounds like a bristleworm - they are good guys!

 

[Drvillen]

Sounds like a bristleworm - they are good guys!

Bristle worms are usually red are they not, this guy is dark brown on top and beige underneath....