What is this on live rock?

[shabubbles]

Can anyone tell me what this is? I couldn't find any reference/picture of it on any of the reef tank sites. It's white and has a round center.

 

[ezy33]

Most likely feather dusters. Does it retract when bothered? A better photo would help.

 

[shabubbles]

I've not tried to or have seen any of the fish bother them. They are stationary. Nothing changes about them...no growth (length and width) or movement.

 

[shabubbles]

Just to close this out, I found something online about this and it seems like its a jellyfish...before it buds off. Thoughts?

 

[mr_X]

They look like hydroids to me. They shouldn't amount to anything, but just keep an eye on them.
Indo Pacific Hitch Hikers