Been search through live rock hitchhiker posts but couldn’t find what this might be. Realize picture is not great. It looks like a feathery moth antenna.
When I turn on the white light is blends in. Super transparent going to break out the big camera try and take a good picture. These phone la are good but mine stinks.
Edit: researching it probably a hydroid. Looked up feathery hydroid and there are several. Charging the camera battery so I get some pictures tomorrow hopefully.