So finished out QT. The two spots I was worried about never expanded in number. However within 3 days of being in the DT he looks like this. Looks pretty firmly like ich to me

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I don’t know how he didn’t show any symptoms for 21 days in therapeutic copper, and the only symptoms were two questionable dots then nothing more. This is really unfortunate. I’m 100% positive I maintained therapeutic copper at a minimum of 2.35 mg/l. More typically it was at 2.5 mg/l. There were no other fish or additions during his QT process. No cross contamination. Nothing.
This now will be the second QT break through I’ve dealt with. First one was velvet that snuck through (that one was probably more so on me) but still. A 72 day fallow period is not fun nor do I know that I can pull it off with space.
The spots are only on the clear portion of the fins. Nothing on the body but looks pretty clearly like ich to me. No other symptoms and still eating well. Haven’t noticed anything on any other tank mates yet.