I have a strange worm..I think!

[Snowdrop68]

I am almost positive it is a worm, it has a white head, and redish orange to yellow body. it darts around my tank like a mad man..it wiggles and darts.. it is about 1/2 inch long. in the video it looks all white. I am trying to get my daughter to video it in the solo cup she caught it in. Sorry for the glare in this video, she found it last night and was What the heck is this?? and do we want to keep it!

 

[andrewkw]

Looks like it's an epitoke (stage in bristleworm life). See https://www.reef2reef.com/threads/swimming-worms-epitoke.636534/

 

[Snowdrop68]

Thank you!! That looks just like it! Now.. is it good or bad??? lol