They move like millipedes, so have a closer look at them. They should have a row of tiny legs down both sides. Baby millipedes are great at cleaning away old food.
I keep different millipedes as pets, even one kind that will glow under a UV light, just like scorpions do. When I first looked at the photo, it looked like baby millies, and then the video seemed to confirm it. Pick one up and put it in a glass if you have difficulties having it walk on you while you check it out.