I was just reading through some of the other forums and saw pictures of the same worms I have. Awesome. If they are little OCD bottom cleaners...they are just my type. I'll save the worm eating fish for emergency use only!
When I purchased my live rock, I first noticed some hairy worms that live within the holes in the rocks. They don't get very long, but now they've multiplied like rabbits and they're freaking me out. I would say that are a couple inches long.