Help ID this

[cubbyman60]

Hey all,
I saw this swimming in the sump. I've never seen anything like it before. Curious as to what it was.



Thanks.

 

[Lionfish Lair]

It's an epitoke.

 

[Cary Meredith]

are they good, bad or indifferent?

 

[Lionfish Lair]

They're one way in which worms in our tanks reproduce. It's the backend of a worm that separated and is swimming to an area to spread eggs and/sperm. They are cool to see.

 

[cubbyman60]

Thanks for the input. What do you think it is? A bristle worm? Or just too tough to say.

Thanks

 

[Lionfish Lair]

Yes, a bristleworm of some description. Could be the commonly seen variety or something not as obvious, like a syllid.