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Have you tried using CP or copper in your main QT (the one with the HOB and biomedia)? If so, how did it go? I've never had to use either drug. I have tanks I can set up as uncycled, sterile QTs if the need arises, but it was my bad outcomes with sterile tanks that led me to my current QT in the first place.
I have not had to use copper in years. CP I have used in the 20L on a few occasions and it was fine. There are conflicting reports on whether CP kills the bio filter or not; I don’t find that it does. 20L can function both as an observational QT and as a hospital tank. The mini reef tank QT never gets meds.

