If you add new fish down the line, introduce them when lights are off, and try to add them in pairs instead of solitary. That way if the tang were to be a jerk, his focus would be split, so to speak.
You could sump the tang if you were able to catch it.
But IME, my purple tang was very chill. I added the following after the purple was introduced:
3 copperbands (which all died)
Falco hawk
Various wrasses
Some anthias
Kole tang.
Out of the above the only one that died was the kole tang
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