I work at a Petco, and I QT everything that hits the stores system. but if you get it in he shipping bag direct from SUstainable Aquatics, ORA, or sea and reef etc I personaly forgo QT. as long as its direct from the breeder, not a third party vendor that carries their fish also (like quality marine, A&M).
Although quality marine are very good, and some will risk it, all my wild caught fish get QT