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Looks like hydroids
Those are probably feather duster worms, though I'm not sure which species. Here are a few that have similar branched tentacles though:
That is an aiptasia lower right of zoa.
Obelia geniculata are branching colonial hydroids, and while they may sometimes look similar to that picture (albeit with the polyps coming off the central stem unevenly spaced rather than directly across from each other - Plumaria spp. hydroids are a bit closer since the polyps are evenly spaced on the stem), I'm pretty sure the specimen in that image is actually a crinoid (feather starfish) or (if it has a tube out of sight in the image) a feather duster, as the feathering coming off of the main stems of the tentacles seem totally smooth and not bumpy like you'd find with the polyps jutting off the tentacles of a hydroid.Not duster worms. Thinking Obelia Geniculata hydroids as pictured below or even Bryozoans
Thanks. Yeah, they retract very quickly when there is any activity around them.If you zoom in on the photo, they appear to be feather dusters/tube worms.
Based just off the photo, I am 99% certain in the tube worm ID.
Do they retract very quickly when touched?
~Michael