here's the best i could do with a camera phone:
to the right there's a chiton and to the left it's this thing. i think they may be egg sacs now but of what? maybe nudibranches? they're a PITA to remove and barely come off when you run a mag-float across it a few times
here you can see two circle looking things which is what im talking about, inside this sac looks like eggs
when i saw them on the colony it looked like it was two needle-like things connected to this sac with the small eggs attached to the zoanthids
when i did the fw dip nothing came off and taking them off with a razor was really difficult