Labeotropheus fuelleborni is a powerfully built mbuna from Lake Malawi, distinguished by its unique downturned, undershot mouth equipped with a specialized bony lip — an adaptation for scraping algae (aufwuchs) directly off rock surfaces in the wild. Males are typically brilliant blue, while females display remarkable polymorphism, ranging from orange (OB morph) to blue to marbled patterns, creating a colorful colony even within a single species. This sexual and color polymorphism, combined with the male's vivid blue coloration, makes Fuelleborni a striking addition to mbuna displays. Like all mbuna, this species is highly territorial and aggressive, particularly between males. It inhabits rocky shorelines throughout Lake Malawi and is a dedicated aufwuchs grazer. In captivity, diet is critical — a high-protein or meaty diet will cause digestive bloat, which is often fatal. Feeding spirulina-based foods and blanched vegetables replicates the natural herbivore diet and keeps fish healthy. Fuelleborni is a maternal mouthbrooder, producing clutches of 15–40 eggs. It requires a well-planned mbuna community with dense rockwork to manage territorial aggression effectively.
