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What you describe has happened to me.
My fish are all older than 5 years, some are 10 years old. In the beginning I did have ich, but I didn't do anything for it. The infection resolved itself, it did come back sometimes in the beginning, but now I have not seen any ich in my tank for at least 5 years.
I think people over react to ich infections. The treatments are sometimes worst than the disease. Also some individual fish are just more susceptible genetically IMO.
I do agree with your "breeding condition" theory. Mature fish are much more resistant to many stresses.
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