Help with an ID?

[scottghs]

Sorry about creating another ID thread, but I am not terribly sure what this thing is. More importantly, it is growing on a rock of Zoa's that I have, and I want to know if it's invasive and if it should be totally removed or maybe translplanted to a different/safer part of the tank.
Thanks!

 

[teresaq]

anthelia

 

[reefrunner]

Not the greatest pic, but it looks like somekind of xenia to me. If so, they won't harm thing, but they do grow like weeds, and can take over your tank if left alone. I bought a small colony, and within six months, had to go in and remove almost all of it. It had taken over the entire front of the tank.

 

[bimm3rb0y]

i believe those are pulsing xenias...i have a few heads stuck on my chaeto when i got them from my lfs...FREE!!!

 

[steve24]

the polyps look like those of a xenia "but" where is the stalk