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Originally Posted by Beverly
Stress alone will NOT cause ich. Ich has to be introduced into a system, either on a new fish, in frag water where there was ich in the tank, a cup of sand from someone who has ich in their tank, or any other means of introduction, before it becomes active. Stress may cause a fish to become more highly infected with ich, but stress cannot cause ich.
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That is why it is best to put the fish in QT for a few weeks before introducing it to the main tank