It's the fish that need to be qt for 6 to 8 weeks, not the corals, because of the life cycle. If you read the article on that link that was just posted by sphelps, it explains it pretty well.
With corals, you dip them in Revive (or something similar), and have a separate QT for them, with no fish, for a week or so, before adding them to the DT. I haven't bought any new corals for a while, so haven't done this myself, but that is the best practice as I understand it. I am sure there are others on this forum, that could tell you more about that.
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