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Looks like either a hair worm (Cirratulidae) or a spaghetti worm (Terebellide) to me - if the tentacles all come out from a single point, it’s a spaghetti worm; if they come out from basically all over the body it’s a hair worm.
Thank you so much with some more research it’s definitely a hair worm. That would be spot on, I was definitely concerned at first but they seem harmless just rather unsightly lolI always struggle to tell where all the tentacles are coming from in pics with these guys: