Noticed some spots on the mushrooms in the tank, I initially thought that it looked like a lot of little mushrooms growing on the mushrooms. On closer inspection I fear that I have a flatworm infestation. I have not introduced anything into the tank in two years or more. They only appear on the mushrooms and nothing else which originally led me to believe that they were mushrooms, but I don't think they are. Does anyone know if it's possible for flatworms to be dormant for a long periods of time. If not I have no idea where the infestation came from.