Polychaete night time swimmer ID help?

[AaronFReef]

I just turned on my moonlight for first time ever while feeding coral about a half hour after full lights out and saw some weird swimming worms for the first time ever. Are these epitokes?

 

[Retro Reefer]

Most likely epitokes.. I’ve seen them in my tank after lights out and they tend to swim in a corkscrew like fashion. A picture I caught of one of them

 

[AaronFReef]

It was! I captured one and left it in a Petri dish overnight. It was filled with eggs in the morning. Fun things when you keep a reef tank and look in the dark!