I'll be honest, I went fairly basic for my QT setup. Bought a standard freshwater setup for like $80 from Petco and then added a few basic things. Added a timer for the light, some stuff in the tank for hiding (the plumbing
PVC pipe in the background of the vid) and a good electronic thermometer. The filter is
HOB Whisper Powerlifter 20 for that 20 gallon tank. It seems to be doing the job but I'm only 2 days into actually using it.
My main tank is 65 gallons and I know I'm going to end up with some decent size fish so I wanted a 20 gallon QT in case I needed to move one of the fish into there.
I did let it run for about week before putting fish in it and I checked all the readings to verify that everything was good. I also used water from my main tank. The only thing I had to do was remove some saltwater and add fresh to get the
salinity to where it needed to be.