Little transparent hands on live rock

[SGT Henry]

There are tiny transparent hand like things that come out of a puny hole in the rock...They arent even a 1/4 inch in size...I imagine they are sometype of feather duster but which one???....Theres quite a few of them...When they come out they turn like a little sattelite dish for a few seconds and then retract.

 

[Florida8]

Could be feather dusters or even a filter feeding crab in your rock, but with quite a few probably the dusters... sounds like a lot of life on your rock! Cool beans eh?

 

[adnoh]

i have the same thing. Its probably a feather duster.