I'll admit I DON'T QT.
Even though I have all the stuff to do so. I'm just lazy I guess. Luckily the worst thing I've gotten is some aptasia and planaria flatworms. I know I should, but I just don't.
That being said, I am quite careful of most of my purchases. I'll look at a fish for a while, then come back a day or two later and see how it is. I'll ask to see it eat, and watch how it behaves. If it's okay, chances are I'll take it.
Frags, I just put a couple of drops of FWE in the bag before I acclimate it.
B