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I don't believe it to be a bristle. The iridescent makes me think bobbit possibly. Can you get a picture of the head of it? Does it have 5 antenna?
It does look like that carribean fire worm!!!! Should I try to remove from my tank??Looks like the Caribbean Fireworm, Eurythoe complanata (While technically a fireworm, in practice it's basically the same as Linopherus, the common bristleworm but gets much larger.):
Eunice worms:
"Bobbit" worms, a type of eunice: