I think a 4 foot cube would be enough swimming room for any tang.
I look at it as, how much can they swim without having to stop and turn around? In the 4ft cube, is is never, they can swim 16ft before doing one lap. In a 6 ft tank, it is just 6 feet because of rockwork and corals.
Sure they have to turn a bit, but what fish on a reef dont turn all the time? They dont swim perfectly straight. If a 6ft tank is good enough, I would say a 4ft cube is more than large enough.
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