What is it?

[GMay]

Found this the other day. Tank started last May with Gulf Live Rock. Figure it came in with the rock.

 

[Apotack]

Hard to see, can you get a better pic?

 

[fishgate]

Looks like Aiptasia or Majano.

 

[cloak]

+1 Aiptasia

 

[rssjsb]

Definitely looks like an anemone, and the disk looks right, but those tentacles look kind of wide and flat for aiptasia. Better pic might help.

 

[GMay]

I have trouble tanking pictures of this but here is another go. I does have flat rather than rounded tentacles. They also have a stripe light dark pattern.
Here is another picture.

Thanks all for the comments and help!

 

[Apotack]

It looks a lot like one that was on my gulf rock. It's harmless leave it its a nice addition

 

[Apotack]

Check this http://www.tampabaysaltwater.com/thepackage/organisms.html