ID on live rock?

[OneReef]

I have something on one piece of my live rock that is starting to spread. Is it good, bad? Do I need to nuke them with kalk paste? They are spreading pretty fast.

 

[Anemonebuff]

Maybe:

http://www.melevsreef.com/id/anthelia.html

or

http://www.melevsreef.com/id/clavularia_sp.html

 

[OneReef]

Maybe:

http://www.melevsreef.com/id/anthelia.html

or

http://www.melevsreef.com/id/clavularia_sp.html

Could very well be. Came off a piece of live rock from the LFS. Been in my tank awhile, but recently these little guys took off. Fortunately, it was on a piece of rock with no coral on it so I banished it to the sump. I want no fast growing coals that takeover in my tank......... including xenia, kenya, GSP, etc. I have seen clove polyps literally take over peoples tank before. Every inch of rock covered. Even powerheads and locline.