+1
there is no tang 4 that size.
but if it is a must have for ur tank then a baby kole/yellow eye tang would be my choice, cause they are one of the smallest tangs in the hobby.
but i wouldn't. even tho it could happen.
there is a 1in baby blue tang in my LFS 12gal nano. so i think a 1 in yelloweye/kole tang could be a possibility for a 33gal.
but not a permanent fish maybe like 3 or 4 years depending on how fast they grow. or longer i dont know, i dont have a lot of info on tangs. but i do know that u have to have a lot of algae in ur tank.