I've had the same experience with fish dying when you remove them from the display tank. I think that when they are already sick and you add the stress of catching and removing them that finishes them off. I've found QT most useful with new arrivals to prevent others from getting sick. My fish occasionally get Ich and my Blueface had ane eye infection but both instances were cleared up by attention to water quality and maybe my UV.
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72 G Mixed Reef
155 Bowfront
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