Definitely wait for an upgrade, while the powder blue stays at a "decent" size (ie not as large as most tangs), the regal will grow like crazy and likely get to about 6" in a short amount of time as they eat like pigs (I would guess less than a year). I got mine when it was a few years old and thought I would be safe but he's still growing (although he's slowed down some) and is now about 7".
If you're not thinking about upgrading its likely you'll have to rehome the regal in a year or so as it will be too big for that tank. Then you will be able to think about adding the powder blue tang (and not with any other large tangs).
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Christy's Reef Blog
My 180 Build
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