You can easily add another fish or two I would say, my tank is approx the same dimensions 72x24x24 with similar filtration and I have alot more fish in mine.
My tank currently houses:
Naso Tang
Powder Blue Tang
Yellow Tang
Regal Tang
Bicolor Angel
Flame Angel
One spot Foxface
Lawnmower Blenny
2 x Pink Spotted Gobies
3 x Ocellaris Clowns
2 x Cleaner Shrimp
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