Thanks everyone for the input. I first tried to catch the video in a clear container, but that ended up worse than the white ashtray. I too thought they were blood worms, but I have yet to feed live food in this tank and am unsure where they came from. Must've hitched a ride on something I added to the tank. Unfortunately this is a shrimp only tank at the moment. Is there an easy way to catch these things other than siphoning the substrate? Sucking up aquasoil then adding it back into a shrimp tank doesn't sound like a good idea. I have a community tank that would benefit greatly from fresh live food.