Need help with ID'ing what's on new rock

[panathinaikos55]

I bought a new rock from LFS about 3 weeks ago to help seed a new tank. I was gone for a week for work and came back to some growth on it. Any idea what it could be?

 

[coralbandit]

Looks like a Zooanthid to me...

 

[panathinaikos55]

I was thinking some Zoa or a Paly or something. Thanks.

 

[Sniperhank]

Button polyps.