I would never use copper and I don't use a QT. Just give the infected fish a better, stress-free environment to live in and it will cure itself. Ich is always there, it just shows up when the fishes immune system is low.
There is no way to avoid getting mixed signals with this and many other topics in the marine world, everyone has their own opinion based on their experience. Take it all in and do what feels right to you.
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