Yeah there are different strains or variants. Even some that tolerate hyposalinity. Each time you bring in a new strain you'll see an ick breakout. If you don't bring in a new strain the one in your tank will eventually die out. I forget the exact number but what was found in research is that after x number of cycles of growing ick in the lab they found that it suddenly died off completely for unknown reasons. On my tank it took a little over a year of not adding new strains before it completely went away. Now my fish (Hippo included) never break out with ick. A few weeks ago I found my temp was getting down to 68-70F at night (bad heater) and not a spot on any of them. So now any new fish will get a lengthy qt period before going in that tank.Originally Posted by RayAllen
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