Hey John, theis thread reminded me of something I read,
If you have access to Eric Borneman's book "Aquarium Corals: Selection, Husbandry and Natural Selection" he briefly mentions an experimental/optional process in making a home made coral ration (p64).
In a nutshell, it mentions adding small amounts of produce items with a high pigment content, like eggplant skin, carrots, tamarillo, kale, etc. Whether or not the material contains usable forms of pigment is unknown, but it's addition is not harmful. Also, powdered pigment complexes are available thru health food stores.
I have no experience with any of these additions for color enhacement (except garlic, peas and broccoli- I put this stuff in for the fish. They eat the food and no one has died yet)
Good luck,
Ben
-"Talk amoungst yourselves"
Linda Richman