Small fish will give you the natural look. And groups of fish. Rarely are fish alone on the reefs, unless they are a top predator and even top predators aren't found alone in rich areas.
In a 75 gallon tank, a clown anemone combo, a pistol shrimp goby combo, a large group of cardinalfish or small anthias, and then a bigger centerpiece fish like a small tang as Recty suggested or a copperband butterfly or maybe a pair of dwarf angelfish. That would be a pretty natural looking tank and most fish besides maybe the anthias and copperband would be pretty beginner fish.
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