Roll of the dice IMO.
Never know what is going to be aggressive. Had a bristletooth tang be the most aggressive thing in the tank. Smaller than the other tangs by a large margin and added in the middle. Also had a blue tang get super aggressive.
Having lots of areas in the tank for fish to "make their own" might help as well. I did this when adding the gem tang to a tank with a black, purple, black hybrid and three yellow tangs (not to mention other body shaped tangs), left him in there for months and 0 aggression when let out.
Never know what is going to be aggressive. Had a bristletooth tang be the most aggressive thing in the tank. Smaller than the other tangs by a large margin and added in the middle. Also had a blue tang get super aggressive.
Having lots of areas in the tank for fish to "make their own" might help as well. I did this when adding the gem tang to a tank with a black, purple, black hybrid and three yellow tangs (not to mention other body shaped tangs), left him in there for months and 0 aggression when let out.