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The color in his bill is his reserve, same with the yellow color in his skin, and the orange color of his feet. He isn't deficient until all of those turn pink, but you want to keep his reserves full. Just fill him back up. I second the recommendation of sweet potatoes. None of my ducks like...

His bill is being depleted of carotene. This suggests that he needs more to meet his vitamin A needs. Try feeding him carrots.