What’s this?

[DelRayTank]

Was dipping some new corals and this worm (?) was on the bottom of my acclimation bucket. What is this?

It’s long and extra narrow and moves around like a snake. Should I be worried about this or is it harmless?

 

[DelRayTank]

Here’s a GIF to make life easier!

 

[KJ]

Here’s a GIF to make life easier!

Dorvilleidae nothing to worry about.

 

[DelRayTank]

Thank you!