LionFish says......
Well, I suppose there is a chance that it is possible but I don't like the Tangs chances with a Trigger. Triggers have a very aggressive disposition in any tank no matter what the size is. Tangs are not wimpy little fish but if you compare them to a Trigger they wouldn't stand a chance. I have seen Niger Triggers with some Tangs but I have also seen the triggers quickly turn against the Tang and tear it apart. You could possibly try a Niger Trigger with a Tang but that would be about the only Trigger that might be compatible. I wouldn't advise it but others may have different opinions.