Thank you. They looked scary enough and were uninvited so I tossed them - better safe than sorry.
Eunicidae family include bristle worms, dorvillidae, what people call eunice worms, and others, one of the largest distinctions in these worms is their mouth parts. Bristle worms dont have the prey capture apparatus of most of the other eunicidae members. The only thing a bristle worm is going to catch is if its dead or dying. The ones commonly referred to as eunice worms like the bobbit worm and its smaller cousins all have mandibles that pierce into the prey item to hold it in place while they eat it. Dorvillidae have these mouth parts as well. I am unsure why they are referred to as reef safe, its probably based on size as they rarely exceed 1.5" which would make them incapable of harming most fish and corals, clams and most cuc would not be on the menu. There is anecdotal "evidence" that suggests that the white ring just behind the head segment indicates its not dorvillidae, how true that is idk. There are many members of this family and many that stay quite small which could mean they are also "reef safe" but with the proper prey catching parts what prey are they catching? Pods, other more "useful" worms, maybe flat worms? I think better safe than sorry is probably the right choice.