I have a 20 quarantine tank with a Marineland 160 Penguin power filter with the bio-wheel. When the tank is not in use I take the bio wheel and put it in the sump of my 75g tank. They way the filter stays cycled.
You need to cycle the tank or you will have to do small water changes every other day
My quaratine tank consist of the Penguin filter, heater, small powerhead,and I broke clay pots in half to give the fish some shelter. It also has a light, but that isn't absolutely necessary.
I quarantine my fish for 1 month minimum.
HTH
Susan