tetrabits are supposed to enhance fish colouration (at least the red bit), there's a Taiwan brand fish food that my fiancee uses in her tank that produces excellent colouration according to her. The brand is "Hai Feng" and the food is called "Bao Zheng Hong" if i'm not wrong.
alternatively, you could try feeding frozen bloodworms/brineshrimp or live food. I've also heard that fish love these and produce better colouration after being fed these (perhaps because they're happier?)
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