When I am filling my quarantine tank, I just do a water change on my display and use some of that water. A filter may be required depending on what you want to do, the hob filter I run the entire time, I just don't put any carbon bags in it when medicating. Mine is a 10 gallon starter kit from walmart that was about thirty dollars and then I just added the powersweep and a heater that I had laying around but you could use any sort of powerhead (just don't stick an mp60 in a ten gallon). The small tank is easy to setup and take down, and like I said requires very little medication to treat the fish.