Purple Tang, Scopas Tang and Yellow Tang?

[ocean diver]

I have had a purple and a yellow tang together with no problems, but like said already depends on how long you have had the tangs in your tank already. Of course add the new fish during full tank lights out and also it also help to re aqua scape your rocks just before adding the new tangs so that every one has to find a home again.

[Aquattro]

I had a purple and yellow together for 2 years, no issues. Until last week. Yellow beat the crap out of the purple, had to remove both.