for a natural look, nothing beats a group of small shoaling fish.
a group of three to five blue chromis (not blue/green, these are a caribbean species that tend to be less likely to pick eachother off), plus a mated pair of shrimp gobies with a pistol, or a jawfish, a blackcap basslet and a blenny of some sort (saddled blenny, or a fang blenny, maybe a tailspot)
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