Live Rock Hitch Hikers

One of the pieces of live rock I bought yesterday has about 5 or 6 Christmas Tree worms or Horseshoe worms. I'm not sure which yet. These frighten more easily and retreat into their tubes more than the one I already have. I first noticed them when I saw movement on the rock when I approached the tank. There are 2 or 3 larger red ones and some very small ones that look gray right now. I'll post pictures soon.