I read something very interesting over at RC about Ich. Apparently Ich dies out in a tank if no new Ich infested water/fish is introduced into a system for 9 - 11 months. Something about after the 35th generation the population isn't genetically viable anymore.
I don't really understand exactly why that is, becuase Ich is a single cell organisum, it doesn't reproduce sexually. I am still skeptical, but the source seemed to be legit, and referenced some actual research.
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