Hi, I am adding some cardinals (5 or 6) to my 25 gal tank. I would like to QT them (1-2 wks) before addition. I have never used QT before. All I have is 2.5 gal hex tank, which I have been using as hospital tank before. It was OK in those cases as I used it treat 1 sick fish. Now how to QT a group of cardinals? I know bigger is better, but I don't have one now. Please advise as to now I can accomplish this with this small tank. I will be very diligent with daily water changes etc. Also, can I get away with 1 week or ~10 day QT. I know a small tank QT can be risky in itself, esp for large or group of small fish as in this case. Please help. Thanks so much.