underwater caterpillar?

[bloodyworm]

Hey there experts..

I just spotted this caterpillar-looking worm in the corner rock of my aquarium.. can anyone ID this? it gives me the chills up my spine..

It squirms in and our of the rock crevices dragging leftover fish pellets into its home..

Thanx!

 

[ezy33]

bristle worm. Nice pictures!

 

[roka64]

I think that looks more like a fireworm, in the 1st two pics. Is it the same worm in all the pics?