Need help identifying hitchhiker...

[BayouTurtle]

These came on a live rock I got from my LFS. They look to have green centers with ridges running from the center out to form spike looking tentacles. They will close up when the lights are out and fully open as the light hits them. Sometimes as much as doubling back on themselves. Since I have added the light they seem to have some new growth and one of them looks like its slowly moving. Any help would be appreciated. Thanks!

 

[garethwood]

palys?

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[BayouTurtle]

Thanks for the suggestion, I'll look into those.

 

[Sugar Magnolia]

palys?

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Yes, palythoas.

 

[JUNBUG361]

Button polyps

 

[BayouTurtle]

haha thanks guys

 

[AlSimmons]

Protopalythoas.

http://www.advancedaquarist.com/2003/2/inverts