here's a good and informative article on color pigmentation in corals...
part 1
http://www.advancedaquarist.com/2009/1/aafeature1
part 2
http://www.advancedaquarist.com/2009/2/aafeature1
part 3
http://www.advancedaquarist.com/2009/4/aafeature1
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