Proper size for tangs?

[SharkBait48]

Hey guys,

Starting the process of a new build, and want to have the right size of a tank for the fish I am considering.

I want to get some opinions on the proper size for a:
(Not all in one tank)

- yellow tang
- powder blue
- purple

Possibly
- hippo
- Achilles

I was thinking of a 150 or 180 gallon.

I have looked online for reference but would like to have more close to home opinions on the matter.

Looking to have these fish in a tank where I can raise them comfortably to adult hood and beyond.