I was always told 1" of fish per gallon. That is final fish size.
Two clowns would equal 6 inches of fish because when fully grown they should be 3 inches each.
So, 32 gal - 6 = 26 inches of fish left.
Don't know how well that works. Take with a grain of salt.
I think a better way would be square inches of fish.
The same inches for clowns (3x1 each). But for tangs (Whole other problem with needed swimming space, but using as an example) They are 5x4 inches grown then that's 20 inches.
This leaves only 6 inches of fish left to put in tank to max fish. (2 clowns + 1 tang + 6 inches of more fish = 32 gallon tank)
Sorry, a lot of talk for not being sure ;Shamefullyembarrased