Everyone has their own way to do things that work for them, so calling people or their methods dumb is just not okay.
Research has concluded that: Quote from Marine Ich - Myths and Facts "Fish always have MI. Untrue. In the wild they often show up as 30% infected."
As ich has a fish free stage-namely cysts which last 60-76 days on the substrate, it points to the fact that there are periods where fish are indeed ich free as its a parasite-not a disease.
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