Best way to add new fish to your tank?

[jalemboo]

bring home a beautiful purple tang on Saturday from Big Al, as soon as I put her in my tank, everyone is attacking her none stop. I had to remove her to my nano tank for the time being. what is the best way to introduce new tang to your aquarium with 5 other tangs?

I have yellow tang, salifin tang, regal tank, scopa tang and clown tang in a 120 gallon tank.