Worm ID help, please!

[subbedout]

We noticed this guy coming out from some live rock. He looks like a blueish-grey earthworm with a retracting fan-like mouth.about the size of a skinny earthworm. Any idea what it is? Looks like nothing I've found on Google (bristle worm, Medusa worm, syllia worm,etc.) Thanks!

 

[Randy27]

I'd say medusa, but those usually have fatter, more bulbous tentacles. It's tough to tell from the pic, but it seems like those tentacle look as fine as a fan worms', right?

 

[subbedout]

It's like a mini feather duster worm at the end. Many others have said it's a peanut worm.

 

[mcgyvr]

It certainly looks like a peanut worm from what I see there..
Its harmless