Fireworm??

The head shot doesn't show enough detail but the overall look says Eurythoe complanata to me and that's one of the benign scavengers. Reefers typically use the common name bristle worm to refer to members of the family Amphinomidae which this belongs to. Fireworms are a subset of the family comprising large species which has hollow bristles filled with a defensive toxin. This guy is both a bristle worm and a fireworm. The little reddish ones are just bristle worms.
 
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