For posterity's sake, I'll just update this and mention that the hypo didn't work. Or at least my hypo set-up didn't work. After 5 weeks in hypo, and 1.5 weeks in hypo plus paraguard, the purple tang got ich again. I think water from the main display got in to the QT system at some point, and the salinity bumped up a bit.
Fish are all now in the garage getting treated with cupramine.
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