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if the difference between the two tanks is the CO2, maybe consider slowing getting it acclimatized to the water from the main tank. have the weak angel in a bucket/pail with water from the QT tank, then slowing add water from the main tank. maybe add a few ounces at a time. see how it reacts after when the majority is water from the main tank.
if that doesn't work, then possibly, the fish is just physically not strong enough to handle the CO2 rich water.
if that doesn't work, then possibly, the fish is just physically not strong enough to handle the CO2 rich water.
