I have a 125 reef fish in now breeding pair of clowns breeding pair of Cardinals flame angel and small flame tip tang. The total water vol is 170 gallons with sump.
You could get a lot more fish in that sized tank if you wanted... depends on what you’re looking for out of your tank...
A group of anthais would be nice, they like to swim in open water and are really colorful
A Fox face is a cool big fish
Wrasse could be nice
I have a diamond goby that keeps my sand bed clean...