There is a build thread here on RC with a
900 Gallon tank that has multiple pairs of tangs, IE: Sohal, Achilles, Powder Blues etc...
He would separate them in the QT system with an egg crate, and then take the crate out for 30 minutes, 1 hour each time etc.. and slowly got them used to each other. With his pair of Sohal's he had them for a few months in QT getting used to each other.
Its a huge tank and lot of fish / distractions.