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As Jay said - why not just do the copper for the 30 days? Just curious.I don't really like the original plan, personally. I would use Copper Power or Coppersafe over ionic copper (Cupramine). Copper for 14 days, then removing copper while keeping the fish in the same tank is a bad idea, in my opinion of course.
For ich in display tank, all fish need removed and treated while the display remains fishless. Inverts, including corals stay in the display.
For adding new coral frags, if you want to QT them, I would suggest to just to have a fishless coral holding tank. Leave them in there for a few weeks.