I use the mirror trick as well.
Another thing that I have had great success with is hanging a quarantine tank INSIDE the display tank.
Basically make a rectangular box out of acrylic about 24-40" long with slotted sides and bottom for water to flow in and out of. Put your new fish in there and let him and his tank mates adjust to him over a week. Basically like an acrylic shark cage. Keep the mirrors up at the same time.
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