I have some of the same ones and looked them up once, they are Timarete sp. and are usually known as cirratulid worms as they are in the family Cirratulidae. They reproduce readily and are good at keeping sand stirred up and clean, and every now and then one seems to make itself neutrally buoyant and float around a while, presumably looking for a better spot but usually finding an lps or paly tentacle...
They are in the same order as the two-feeler spaghetti worms that make the sand tubes but are in a different family.
I keep getting notifications for this thread but it appears that threads from the invertebrates subforum aren't showing up in the recent threads on the home page. Is this supposed to be the case?
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