What are these guys came from frags?

[canadianeh]

Long body centipede looking things. Good guys?

 

[Mr_Knightley]

Those a bristleworms, good cleanup crew but can sting you. I wouldn't worry about them, you most likely have them in you're tank already.
Good day and God bless!

 

[canadianeh]

Thank you!

 

[Here we go again..]

Bristle worms. Some folks classify them as a pest. There are some fish species that eat them. They can sting you, the little hairs will get stuck in your skin if you brush against them causing a slight burning sensation.