What are these creatures in my tank?!

[thatmanMIKEson]

Nah, can't even tell.

I can

 

[WyoMt.Chef]

Ok so I noticed these little tunnels in my substrate and was curious. As I got a closer look I saw tiny little worm-looking things moving around. They seem to be sensitive to light. If anyone has an idea what they could be, please let me know. I appreciate it.

Looks like a detrivore worm. Several varieties out there they'll live in your sand and eat poop, dead stuff and everything else that's dead they can get ahold of. Different polychaetes with most being beneficial, spare a few. Oenea fulgida, and Bobbitts to name a couple baddies. You should be good!