I found this
http://www.cichlid-forum.com/articles/peacocks.phpTaken from "The Peacocks of Lake Malawi" article available on this site by Mark Elieson
In the aquarium, Peacocks readily adapt to and accept almost any commercially prepared food. While they require animal protein in their diet, it is wise to also provide some Spirulina to keep their blue color looking its best. Similarly, a fish food with krill will maximize reds and oranges. All reputable cichlid foods contain an adequate amount of yellow pigment so as not to be a conscious concern in the selection of food. Frozen and live foods can be fed periodically but these are not essential. A quality fish food with high levels of protein will be sufficient. If used, frozen and live foods should only be used as supplements to a diet of flake and/or pellet foods. Also be aware that larger adults will need more than just flake food to keep them in optimal breeding condition. It is best to feed Peacocks only one to two times a day, and never more than they can consume in two minutes. Unlike Mbuna, whose aggression necessitates feeding several times a day, Peacocks have a mild temperament and are very undemanding. Consequently, their feeding regimen should be minimal and infrequent but consistent.
