A yellow tang needs much more room and they stress easy so you could end up battling something like ich, tangs are prone to ich for some reason.
Is it the color of the tang you like? Also the clowns are very aggressive.
I know of one tomato clown that has a 75 gallon tank to himself nothing else is safe in its tank. The fish is over 25 years old so nothing is going to make it change. To reach into the tank they have to use a net to shield their hand from attack.