I used to be a big fan of tank transfer including bleach washing and air drying tanks between steps . I recently changed my mind after going through it with a pyramid butterfly that came down with velvet AFTER going through tank transfer (day 22 of QT). It did not cope well with copper at even the lowest dose so I used CP. Fish survived and is still with me today. I could have lost my entire tank if I had trusted tank transfer and put it in after 15 days.
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