With all these different methods and fish sensitive to copper or this or that and TTM. It seems that in order to have a nice DT with a wide variety of fish one would need to have 3-4 QT tanks setup.......just saying, seems like a lot. I.e- copper tank, 2x tanks for ttm + main tank....
I know if you wanna do something do it right but all this seems like its never ending with trying to prevent different diseases with different fish.