24 gallon is fine for a young tang in my opinion, I was like you, wanting a blue tang in a nano. So I got a young regal tang, I guy I know with a 1000ltr tank told me to go for it, so I did.
I have a very happy
Regal tang
Maroon clown
Yellow goby
Cleaner shrimp
2 turbo snails
2 hermits
My...