Green aiptasia?

My vote is hydroids, I had them in my old tank. Definitely not Aiptasia, Majano, or featherdusters. I'll have to dig out my old pics, tho that may not help ID them LOL.

 

Here's a pic of some hydroids (that made tiny green jellyfish) that I had in my old tank. The ID on these was made by Ron Shimek back in '02 or 03 for me, they used to be on an ID page of his somewhere.

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yeah that looks about right, i cant get a close enough pic to get that much detail but that looks pretty similar to what i have. Any suggestions on what to do with these? Leave em alone? Take the rock out and scrub it?

 

ditto those are definitely hydroids.

 

I don't know what you do about them, I just left mine alone. Of course, then I had tiny little UFOs swimming around in my tank that stung when they touched you LOL. They eventually stopped popping off jellies and went away on their own.

 

get rid of them.