Who wants to play a round of "identify this creature"

[Kait]

I have a new reef tank, and have received a hitchhiker on my live rock. Can you please identify it?


anemone? by [Kait], on Flickr

I'm sorry for the crummy picture. It's the round thing in the middle. I'm thinking it's an aiptasia anemone, but wanted someone with more experience to confirm it (or tell me I'm completely wrong! Because I'm new… seriously… check the post count! ).

Thanks in advance!