I have a yellow and a white cheek that I just put back in my 75, they appear to be content. I have lots of current and crevices for them to explore, so I'm hopeful they stay happy. Also, they both stopped growing years ago, and are about 4 inches without the tail. They share with a pair of clowns and 2 chromis.
I wouldn't recommend 2 in a 75, but 1 is certainly an option. Research species carefully, because some just won't work. Large nasos, sohals, clowns, etc, need a much larger tank, IMO.
Zebrasoma species should all be fine, and a fair amount of acantharus species are options.
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Brad
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