I'd say you need to decide small large or both.THINK OF ADULTS SIZE, NOT JUVI SIZE. So if u wanna go small, 8-10 fish maximum.
If large, get only one IMO. A tang may be pushing it, i wouldn't reccomend one. But a gold-striped maroon clown and/or coral beauty with a few(3, max.) green chromis and a bottom dwelling fish(ex. blenny) would look good IMO.
Remember that these fish have infinite space to avoid each other in the wild, but in your tank, they have only about 1/99999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999
of what they have in the wild, most likely even less than that