What is this?

[bram]

Can anyone help identify this for me?
I just noticed it living under some of my rock the other day, I have no idea where it came from?

 

[sammiefish]

hard to tell exactly...
try looking for a picture of an aipistia or mojano anenome or a button polyp / zooanthid

 

[big boy69]

Looks like aiptasia to me.
Take th e rock out and get some boiling water over it with a turkey baster

 

[ophiura]

I'm not so convinced it is aiptasia...the tentacles are very short. I agree with sammiefish - take a look at picks of zoos, polyps, etc using the search.

 

[bram]

It does kind of resemble the pink variety button polyps like this.