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what is the minimum size of a QT tank for 2 large and 2 medium Tangs , A 6 inch Vlamgi , 6 inch hippo, , 4-1/2 inch sail-fin and a 4 in yellow tang?? I always qt'd my smaller fish in a 60 cube for 2 weeks . These fish will be cramped in the 60 qt. Im afraid to QT them as they might get stressed. they are in a 120 gal tank now, im wanting to put them in a 6 Ft long 180 reef.