If you are only keeping one fish, take a look at one of the brighter damsels (no issues if it is the only fish) or dottybacks (especially an orchid or male elongate for example) - no aggression issues with other fish to worry about, easy to feed, beautiful to look at, won't harm coral, etc.
A clownfish or two (smaller species only) would also work of course, as would a royal gramma or yellow assessor...
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7 reef tanks, 5 freshwater tanks, 2 terrariums, 2 dogs, 3 boys, and 1 very understanding wife!
Current Tank Info: Marine: Pair of 40B's, 45W, 50g cube, ADA 45F at home...IM Nuvo 20 and 10 at office!
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