Worm id help please.

[eb8919]

Hi, i just noticed on one side of my refugium, all along the wall and about an inch into the sand there are these tiny black worms everywhere. There very small, almost as if i took a black pen and started drawing lines everywhere. I can't get a picture right now, but if need be i can later. I've heard of such worms that are extremely bad for a tank, and i am quite paranoid this might be them. Any help is appreciated.

 

[Agu]

How are your fish and coral doing ? Very few of the worms we find in our tanks eat corals.

 

[eb8919]

everything is healthy...theres just a huge colony im worried about because i dont know what they are. i havent seen any in my tank.