When I had to set up a qt I used a 20 gallon long, with a hang on the back filter, water from my main tank & a heater. The first time I set up a QT tank it was not cycled so I did major water changes daily & used amquel to keep the NH3 under control. If you happen to have a sponge of some type in your tank you can use that to help w/the cycle.
I also had a fish that had ick, I used hypo & it worked great.
Hope that answered your questions.