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Thanks JayC, it does say to do that but as I do weekly water changes anyway it wasn't something extra I had to do, but you are right to mention it. I didn't do a 50% water change at the end (as they recommend) of the week as I only ever saw maybe a dozen hydra so got it really early, I think I did a 20% water change! Used it in April and not seen any hydra since and only treated the one time. Simon

Definitely was not around. We had to break new ground with hiding a treatment back in those days. Probably more a precaution, but I need to add this advice ... make sure you do a water change after the treatment period. If you are regular with water changes, than that is not a problem. Depending on how many planaria or hydra you have in the tank, their deaths can really spike ammonia and cause issues. So a water change after the treatment period is always advisable.