I have a Naso, I recommend having some Tang Heaven Red on hand in case it doesn't eat or refuses to eat. Mine is currently eating seaweed salad(brown, sometimes green) and sometimes eats the spiralina
brine shrimp frozen cubes. Also eats the the algae in my tank of the rock work. Not an aggressive fish mine is pretty easy to care for now that he eats, he's around 7-8 inches long with streamers. I also recommend a tank minimum 6 feet in length as they love to swim and make sure it gets plenty of oxygen.