IMO/IME, your tank would be ok for a yellow tang. They don't need a ton of lateral swim space like many of the other tangs. (Kole and tomini would also fit into this category.) Just don't overcrowd the tank and maybe add him last or near last on the stocklist. I've had a purple for about 2.5 years with no issues and he's in a 4 ft. long 110g tank.
Ok so I know a Yellow Tang should be in a 100gal + tank. Would a tank that's 53 x 22 3/4 x 21 be suitable? Thanks