I have a yellow tang and I would love a purple tang so I asked this same question and researched it on RC.
There were people who had YT"s and PT's that got along fine and there were people who had YT's and PT's in a state of open warfare.
My conclusion was that I would only add a PT if I could rely on someone to take it off my hands in case it didn't work out.
My own theory is there may be a gender difference, perhaps some people are seeing male to male aggession, just a theory but there is no other reason I could figure for the difference in people's experiences.
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