Ok, I tried it today in an empty tank with moss. Was targeting hydra but I realized there were planaria on the glass. (Ewwww) Safe to say I don't see anymore hydra, wiggly white worms, snails, or hydra after the treatment. I see a tiny copepod or two but that's it. Very easy application with the little teabag too. Been battling hydra forever. Thanks! Sent from my iPhone using Tapatalk