I have also read about the theory of the ick exhausting itself after a number of generation, but I am not sure it's true. I know people who did got ick in the tank, then they thought it went away because they have not seen it for 2 years, then they get a new tank, tansfer the fish and bang, ick exploded.
Means that it was still there, just to a lever that fish could control to a degree. Once stressed out it came back with a vengance.
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More fish die from human stupidity than any other disease...
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