The ocellaris clowns will be fine.
The blue tang full grown is 12 inches and a dogface puffer full grown is 18 inches+.
If your set on a puffer a toby puffer could work such as the valentini or the hawaii blue spot.
Then i would suggest a sixline wrasse.
So it would be
ocellaris clowns x2
toby puffer
sixline wrasse.