I have 3 tangs in my 6' - yellow, sailfin and tominini. I also have a blue throat trigger, these are my 4 big fish. The yellow is not much of a wanderer, but the other 2 are. That said, they don't race from one end of the tank to the other. Interestingly enough, my clarkii clown is the same size as my trigger.....
While you won't have the length of tank, I think you should be fine as others have noted.
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