Ya, 3 weeks is a proper time in qt, if there is no ick, if any ick is detected, then it's more like 6-8 weeks. The reason why I mentioned flames are kinda touchy is that, they can be touchy to get to acclimate, but once established are pretty hardy. They can be finicky to get to eat, and they have a tendancy to get outbreaks of ick when introduced, or when their environment changes, so that's all I wanted to warn ya about, but they are a great fish, and I'm for sure gettin one even with their touchiness. It's not like there even a quarter as bad as say a moorish or a blue ribbon eel, their just a little touchy is all. Good luck, ali