i setup a QT with just a 20 gal tank, cheap flourescent light hood, heater, powerhead and aquaclear filter. just soak the filter sponge in your main tank for a few weeks, then put it in the QT. i also added some PVC fittings for the fish to hide in. the only fish i have had in it were my clowns. i just put them in to observe. they never had ich or anything so i didnt have to treat them, but i keep them in there for a few weeks anyway.