ID Me?: 2 for 1 special.

I got this from the Happy Coral browned out acro grab bag the other day. Was looking at it today and noticed some movement. The little guy looks like a pink ball with a "mouth" that opens and closes every 5 seconds or so. I'm assuming it's some kind of filter feeder, but I've never seen one before and perusing the usual resources didn't yield any information. I think it's soft, but I can't really tell since it's hard to get my finger in that nook between branches - I thought about poking it, but I don't really want to risk injuring it until I know if it's harmful or not. It doesn't seem to be bothering anything. Polyp extension seemed unaffected in that area (there's no PE in the picture because I moved the frag to get a better shot...it didn't like that).

And, while we're at it, any idea what species of acro? I'm not too familiar with them :-X

 

It's a barnacle that the Acro has grown around.

As for the Acro i am thinking Acropora verweyi.
Corals of the World Factsheet and images - Acropora verweyi

 

Well that's cool. I've never actually seen one in person until now. I suppose he can stay for now, since he doesn't seem to be causing any harm.

As for the acro, that looks pretty damn close.

Thanks for the IDs!

 

Yeah the barnacle is nothing to worry about. It wont harm anything.