Does anyone know what this black worm is? Inside my rock.

[gloaquaticsNY]

Can someone please help me identify this worm?
Would it harm my corals?
It came with a live rock from my local pet store.

 

[Reefkeepers Archive]

Does it move/react to stimuli? Could be a stalked hydroid. @EeyoreIsMySpiritAnimal @ISpeakForTheSeas?

 

[gloaquaticsNY]

Does it move/react to stimuli? Could be a stalked hydroid. @EeyoreIsMySpiritAnimal @ISpeakForTheSeas?

Yes, anytime I even put my hand in and the light some how dimmed with movement it goes back in its little hole. Tried to catch it with tweezers but no luck.

 

[ISpeakForTheSeas]

Can someone please help me identify this worm?
Would it harm my corals?

Welcome to Reef2Reef!

Based on the mouth tentacles there, most likely a peanut worm - harmless/beneficial.

Probably a keeper.