Could somebody tell me what this is?

[Daniel91]

Sorry for the horrible pics - the place it’s located makes it impossible to get pictures, so I had to video and screenshot.

 

It moves like a worm and stretches a feather in the end. I have smaller feather worms on some of my coral but they are “rock hard”

It retracts under rock if I spook it and moves around like a worm.

[RayWhisperer]

Looks like a peanut worm.

[Daniel91]

20 minutes ago, RayWhisperer said:

Looks like a peanut worm.

I think you are right from googling pictures. Good or bad?

[RayWhisperer]

fine.

[Daniel91]

Thanks!