What am I? Another ID thread

[parameat]

I bought a piece of live rock that has a red mushroom coral and another coral that I can't ID. The lfs said it was a mushroom as well, but they are often wrong. Its bright green and has pink things on it.
Also there were some bristleworms in the rock, they won't hurt the corals will they?

 

[spanko]

Looks like Discosoma sanctithomae to me. Some common names are Warty Mushroom, Atlantic Bubble Mushroom, Warty Corallimorph, St. Thomas Bubble Mushroom. Nice hitch hiker.
http://images.google.com/images?hl=e...=&oq=&gs_rfai=