Yes your tank is big enough to include tangs
I take it these are your first choice as if I were you I would first look at all the tangs that are available.
Have you considered the Sohol, Vlamingi, Kole? Do not consider the Clown as it is almost impossible to keep.
You will have no problems with the Yellow and Hippo. The Powder Blue is one of the most difficult to keep and if you are fortunate to get a healthy one you will be limited by further tangs as they are extremely territorial even in a tank your size. Consider a Powder Brown instead (not a gold rim tang)
Consider a small Vlamingi. Be careful though as you need to see blue spots ALL OVER its body.
Resist the urge to put more than one fish a month in your tank. The tang should be fat, free of tears, spots or blotches.
It should be alert(interested in you)and you should see it agressively feeding.
Pass on the fish if and choose another later if it does not meet the above specs.
As tangs are prone to ich you should feed garlic extract when you are adding them for a while.
All of the above are my opinions.
I keep, yellow, atlantic blue, sailfin, powder brown, vlamingi. I have not had success with powder blue or clowns.
If you proceed slowly tangs will be the most beautiful part of your tank. If you rush things, tangs tend to be problem fish.
Good Luck