http://www.tropicalfishcentre.co.uk/Labidochromis.htm
Feeding:
Labidochromis Caeruleus are Mbuna and Mbuna need vegetables (herbivores) while other Cichlids mainly feed in high protein, frozen and even live foods (omnivores, carnivores or piscivores). Providing Yellow Labs with too much protein may cause the Malawi bloat disease which is extremely difficult to be treated and usually fatal. Restrict food stuffs to good quality Flake food with a high vegetable content and pellets and alternate these with High vegetable content frozen food, Lettuce on a clip (Labs love Lettuce!), shelled peas and once a week or so Live brine shrimp. Avoid Tubifex and blood worms because although they will eat it with relish, tubifex worms should be avoided since they are reported to carry many microorganisms which may harm your fish. Leave them without any food at least once a week.