Why is it that tropical saltwater fish are so much more colorful than their freshwater counterparts?

Why is it that tropical saltwater fish are so much more colorful than their freshwater counterparts?
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Because, believe it or not, in the sunny, clear, shallow waters around coral reefs, the best way to hide is to be brightly colored in that brightly colored environment. However, in most freshwater habitats you need to be brown, green or silver to disappear or look like something that is not edible. Hence, colorful fish are found in the tropical oceans, and “boring” fish are found in ponds, lakes, rivers and streams.
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