I have both in my 135 and they get along fine however the Blue Tang is a fassst grower and will quickly outgrow your tank. I am looking at doing an upgrade for mine soon. My Regal is about 6" and it is evident he needs more swimming room.
My regal has alot of personality and is a trip so if you decide to get one it needs to be as a small one. IME the tiny ones are very difficult I tried 3 times with tiny hippo's and they all died but my current one was about 2" when I got him and has been really healthy.
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