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Think you’re missing a whole big part, maybe the whole part of this thread. When you strain yourself with work/weights you get stronger. A kindergarten teacher hardly gets a cold, etc. A qt eliminates harmful stuff but what if we/they need that harmful stuff? We/they (fish) have an immune system for a reason. Who’s to say if you’re body doesn’t use it’s immune system that it doesn’t weaken you as a whole, not just your immune system.Disagree. You have no way to know what your fish died from. And no one really knows what old age is for a fish let alone many different species.
But that said. Let’s say a person sets up a tank. With 10 fish. That are tank raised. They are never exposed to CI or velvet but they are exposed to bacteria etc. ie their water and food is not sterile. What prevents that tank owner from being successful and raising fish to an old age? I mean were and smallpox and measles. trying to eliminate malaria. There is no reason that a fish raised in a tank without velvet won’t live as long as one exposed to it.