needing a ID on what is on this live rock

[Ghost869]

Hello i recently was given some live rock before i put this rock in my tank i would like to get an ID on what is on the rock. there are hundreds of them on each rock.

 

[Ranjib]

tiny worms/feather dusters. They are not harmful, if you look closely, once they are in the water and settled in, you;ll see tiny crowns coming out,
i love them

 

[Ghost869]

thank you very much!

 

[rkpetersen]

After awhile you'll find them in the darker recesses of your sump as well.

And welcome to R2R!

 

[Ghost869]

After awhile you'll find them in the darker recesses of your sump as well.

And welcome to R2R!

thank you!