The best idea I've heard so far is to not keep your QT tank up all the time. If you want to have it cycled when you need it, then keep a sponge filter in the sump of your main tank until it is needed, and then move it to the QT tank for use. It should do the job just fine, from what I hear.
92-gallon corner tank, 100lbs of LR
, 140lbs of sand, 250watt 10,000K MH
, 110watts of actinic PCs, Mag 7 return, custom refugium, AquaC EV180 w/ Mag 5
Female lyretail anthias, eyelash blenny, tomato clown, saddleback clown, firefish goby, 2 sand-sifting stars