quarantine protocol without copper

Hi, Currently I got ich breakout in my DT and I am quarantining all my fishes in a QT tank, while my tank is running fallow. Meanwhile I have been thinking of adding more fishes to the tank. To be more specific, adding more fishes that are sensitive to Cu treatment and time it in a way where I...

I have a blue dot jawfish that died in QT after a week with a weird large white spot (maybe it happened after it died, It wasn't there last night). My 2 questions are 1) Is there anything else I need to do to protect the other fish? and 2) what is the best way to qt a jawfish, given their...