Why would you want to use a fuge on your QT? Should you have to medicate, all the life in the fuge will die anyway...pods, worms, etc...
Better to just use a simple HOB filter and/or a Bak-Pak with the bio-bale for filtration.
LOTS of nano-reefers are using the Aqua-Clear 500 (or it's current name??) for a refugium. Most replace the impeller with the one from the AC 150 or 300 to slow the flow way down, which allows the fuge to work better. Some other mods IIRC to make them work better, but not sure what all they do...pretty dammed innovative IMO.