Worm on new piece I bought

[lawman]

Today I purchased a hairy mushroom that is attached to a 2 lb piece of rock. I bought this from a fellow reefer. Prior to getting ready to place it in my tank I dipped it in Seachem reef dip. While soaking I noticed a long skinny reddish colored worm working it's way from one of the holes in the rock. Could not get a pic but the best I can describe it as A very flexible red toothpic that moved back into the hole extremely fast. I have placed the rock in a bag of tank water for now. Any ideas what it may be? Harmful or not?

 

[ophiura]

Highly unlikely it is harmful in any way. HIGHLY unlikely, IMO. But the description doesn't narrow it down much further than "a worm" I'm afraid. Probably a polychaete (bristleworm) but most are beneficial.

 

[b-baby80]

I have a peanut worm.It doesn't hurt anything either

 

[mudplayerx]

Getting a harmful worm as a hitchhiker, like Ophirua said, is incredibly rare.

 

[lawman]

Thanks for the re-assurance guys. I continued researching and although I only got a quick look at it, I do believe it is a bristle worm. The rock is in and the hairy mushroom is looking great thus far.