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You need to run copper at the therapeutic level for at least 28 days to make sure you kill it off. I’m guessing it wasn’t completely eradicated and when the copper level dropped it took out the fish.
You need to get all the fish out of your DT and let it go fishless for 82 days. (I believe that’s the correct number of days, may be 72) Otherwise you will still have ich/velvet in the DT and you will continue to lose fish. Place the fish in QT and treat with Cu for 28 days.
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Gary
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