Sorry to go back to this age old thread but I have been scowering the internet for all the different kind of cures and remedies and as expected everyone thinks they are right. Anyway what I would like to know is how can you tell when the disease is in its free swimming stage. On sunday my fish were showing a good few white cysts and last night the were twice as bad I treated the water right away Sunday with ICH medication only to read on a few sites that it is not effective till the disease is free swimming backed up by the instructions on the medication But how do you know when this free swimming stage is? I mean not all the fish are showing sypmtoms at the moment but wouldn't the disease have been free swimming in the first place?