03-20-2011, 02:08 PM
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I know what is it like losing fish in the QT.
Have you tested the water? After the lose of a fish, the ammonia may be higher than normal, so it is hard to tell if the ammonia was caused before or after the fish passed.
Is the tank overstocked? That can cause problems in a QT, as anyone could a imagine.
Do you buy from a "reputable dealer"? Do you have good faith that your dealer takes good care of their fish? I know I keep getting sick fish from my LFS, and it messes everything up.