LR Hitchhiker ID Help Please

[cdnarcher]

I got some live rock from another member and it is fantastic except I have what I think is Aiptasia. Am I right? I picked up some Aiptasia-X, but will not pull the trigger until I am sure. When I touch them with my tweezers, they pull into a little ball.





The other ones, I believe are Feather Dusters, so I will leave them alone, unless otherwise directed.





The tank is not green like the pictures show, the camera sure makes it look that way though!

Thanks for your help.