LOL.
Switching fish from tank to tank is not wonderful, but introducing a sick fish to a healthy tank with healthy fish is much worse. There's no perfect solution to keeping marine animals, but there are things that we can do to maximizes their well being and make the hobby easier on ourselves.
Did you by chance read the FAQ section here?
When you QT fish, the only animal at risk is the fish in QT. Your display tank is safe, as are all the fish in the tank. When you get a new fish, you have no idea what that fish has. But, if you've been in this hobby long enough, then you can bet that chances are good that that new fish has something, and that that something is potentially highly contagious.
Placing a new fish in a QT ensures the safety of your other fish, and it gives the new fish very good odds that, if it does have something, that you will be able to address it with relative ease. And, if the worse happens, and this fish dies, then the only thing sacrificed is 1 fish, not all your fish or, worse, your tank if you, like so many do, attempt to medicate a captive marine environment.