The Naso tang has much more character! The way his colours morph when excited and he'll do a little dance at the front with his full task mask and lipstick on, then it fades away again when he calms down. It comes in short bursts though, the Yellow is constantly pursuing the tank. The Naso also likes to let the bigger Yellow tang think it's the boss. Actually, it's Naso, he's just not that fussed. Like a wise old colonel chuckling at a young recruit trying to gain the others' respect.
It's cute when little scuffles break out. If it's between the regal and the yellow it'll go on for a while, with the smaller regal backing down. If it's between the smallest tang which is the Naso and anything else, the other fish backs down very quickly. But the Naso rarely ever gets involved in fights and he's never the one to start it.