Goldsaddle goatfish -- Parupeneus cyclostomus
Commonly misnamed "Yellow Goatfish" due to it being completely yellow as a small juvi. Max size is a staggering 20" though. They are quite hardy and do well however, and take to meaty foods well, I've seen plently of them in small tanks (under 100gals) do fine, but no idea what will happen when it grows up.
The bi-color goatfish isn't too much better of choice at a foot and a half.....