As always, the best bet would be to qt the fish and add cupramine, however I do worry about that many tangs in such a small qt for that long (I assume you would run a full treatment period). How about moving your shrimp, crabs, zoo's, shrums and tube, to the 28g and then treating the display with cupramine (you could move some sand and rock as well, however I treated a old display tank about your size with about 200 lbs live rock, way back with Cupramine with no long standing effects when I added corals afterwards). Of course run carbon after the treatment to get the medication out.
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RSM 250. Clownfish, Fox face, Blue tang, Yellow tang, Kole tang, Clown tang, Coral beauty angel, French Angel, splendid dottyback. CUC, softies, lps, sps.
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