Well, I have kept an Atlantic Blue tang now for over 3 years
with much success.
Though somewhat aggressive toward tangs with the same body shape, I have a Kole tang, and they do quarrel from time to time, but nothing to worry about.
This variety of tang is supposed to be problematic, with both
housing and diseases, but I have found no problems with
mine.
Diet is not a challenge, it will forage all day on your rock work and glass and loves everything I feed the tank as well.
I vary the diet with spirulina, mysis shrimp, noori and a home made blend of shrimp, clams and mussels.
The Acanthrus tangs do pose more of a challenge then their cousins, but only as far as aggression and size, you do need larger tanks to house some of these varieties.
The mimic tang is another good choice along with the Atlantic blue, since they do not get quite as large as the others. Though I wouldn't mix these two.
The powder brown and orange shoulder tangs have been known to cause more problems housing, and often more prone to disease and refusal to eat.
All fish you bring home should be quarantined before adding to your main tank, to prevent the spread of ich or diseases.
Good luck.