I feed my mbuna(rusties, Lab.perlmutts) hakari cichlid gold. I have been feeding them this for over a year. Its not the only thign i feed them though. I also feed hakari cichlid excel, omega one color pellets and veggie flakes, HBH graze flakes, NLS all porpose pellets, and the occasional brine shrimp or mysis shrimp.
What type of mbuna do you keep? some can handle more protien then others. Labidochromis and Melanochromis species feed on insects and snails in the wild...picking up alittle algae as they graze. The Pseudotroheus, Petrotilapia, Labeotropheus, Cynotilpia lean more towards being herbivorous but can still have some protein foods.