Looks like a spaghetti worm to me stillStill going with this
It's a Phyllochaetopterus.
@vellingapa how long are the arms roughly?
Again, I do trust your ID'S though Phyllochaetopterus (as I can tell from the photos) seem to have a more calcified/smooth tube while I've seen spaghetti worms rapidly construct tubes out of sand like OP has
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