Have a 4 to one ratio of females to males, provide plenty of hiding places, and sand is the best substrate through my experience. i have a heater in my tank and when i do water changes, i add water at a cooler temp to simulate rain, this is a good stimuli for most fish. overall the mbuna will breed quite easily without much effort from you... good luck... i'm in the process of making lake malawi peacock cichlid hybrids myself!