My LFS holds and treats fish for two weeks before they go on display, if you purchase they will hold the fish in isolation for two more weeks if you request. They house most of the fish independently that cost more than 20 bucks. In addition they have sick tanks which they will show you but won't sell to you, if you want a fish that is sick they will hold until healthy and isolate for two weeks. That is why I trust my LFS, myself and 6 of my friends that keep sw tanks have never lost a fish we bought from them. After all of this I put them in my 35 gallon QT for a week anyways. The point I was making is QT is important, but even more so when you have no idea where it came from. How can you trust livestock that you buy sight unseen? Too many horror stories I have heard.