yep agree about the QT tank..
although, I have always stuck by the rule of thumb that these fish have already been through ALOT of stress to that point of ariving at you LFS..
I really dont think it would hurt to wait a few days, this way they can de-stress a bit before being moved again to another enviroment, and also you can observe them some.
most fish stores will hold fish for a couple days when the first receive their shippments..
i know it sucks.. cause you see a fish and you wnt it..
at least thats how I am.. but With everything in this hobby its better to be safe then sorry!