Isn't it fun choosing and reading up on new fish to buy!!!
I think that the naso tank would be suitable and are a good reef species, however do u have any other tangs in your tank? because you can cause problems between the two tangs, and its also not recommended to have two tangs in a tank thats less than about 120g.
In relation to the size, a tang that big in a tank would take an extremely long time, and they generally dont get that big. I would go with the tang mate!
Good luck and hope it all goes well!!