Orange worm in tank

[aqualake]

I just saw an orange centipede looking thing about 1 centimeter long crawling on a rock in my tank. He crawled inside the rock. I googled it and looks like a bristle worm. But not sure. Will this thing eat my shrimp?

[Stalker]

No, but please make some picture.

[aqualake]

Unable to get a pic. It hides inside the rocks. Have only seen it once. Probably only comes out at night. Not sure exactly what it is.

[Mustafa]

If you used live rock or live sand (which I don't recommend for many reasons) it probably is a bristleworm. But yes, pics would help.