I personally really like firefish in a small tank, the purple ones add a bit more color. Also don't overlook various shrimps to make up for having only a fish or two. Cleaner shrimp are very pretty and interact readily with people. Blood shrimp are a bit pricey but also look great. As mentioned earlier a goby paired with a pistol shrimp is also very interesting to watch. Hermit crabs can be good or bad as some will be completely docile while others will kill snails for their shells and irritate some corals. Personally I just stick to snails.
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