What is this worm?
It's worm can be described as a hair-thin creature going through the substrate. There is a small-medium amount of them in my shrimp tank, and I don't know what to do! I don't think they are planaria, as planaria are wider in shape. Can anyone tell me what they are and ways to preventer eliminate them? Pics can't be taken, because they are so tiny that not even a phone camera can focus on it.