I think the gobies are a good bet, maybe a royal gramma, a fire fish would be a good colour splash as well, but for a different shape with good colour I see nothing wrong with a damsel but you will have to set up the tank landscape accordingly. Maybe try a percula clown instead of a maroon as they tend to stay a little smaller and can still take care of themselves.
You now have my 2 cents.
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Greg
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