Food
Coral Beauties with orange bellies have eaten coral before(there is a pigment/chemical that causes some cells in the fish to change color). He probably doesn't like any coral in your tank.
To get him eating, try using liquid additives such as Selcon or garlic additives(there are many out there). Also, try overfeeding your tank, so there is alot of food floating around; it might just spark his interest.
Good luck!!
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