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I've found that if I have a low dose of Virkon in my pond when I introduce new koi to the existing community I have minimal problems, infact, fingers crossed I'm yet to have a problem and I've just added a new batch. Off course I have a relative low density of fish and a very high turn over to help things.
I've also been told that if you keep your koi for a week in a 0.6% salt QT pond it should rid them from most bacteria and parasites before adding them to your main pond. Any truth to this?
Also, would a constant low dose of Virkon or even Ozone not keep the back ground parasites, ick etc. at a level where it does not hold a threat to new koi introduced to the system?
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