Should I be worried about nematodes?
I think that's what they are, it's impossible to get a pic because they are so small. They hang out on the glass, slithering around fairly fast. I think they are too small for planaria, and too fast for limpets. What else could they be?
I have treated the tank with fenbendazole to get rid of hydra, and it's a shrimp tank. There are no fish in the tank yet, will threadfin rainbow's snack on these?