African Cichlids

African rift lake cichlids are the hard-water end of the freshwater hobby. Lake Malawi and Lake Tanganyika sit in the East African Rift Valley, where limestone and volcanic geology produce water that's hard, alkaline, and strongly buffered: GH 10–18 °dH, KH 8–14 °dH, pH 7.8–8.6. These fish haven't just adapted to these conditions. They depend on them.

The high mineral content serves two functions. Calcium and magnesium (measured as GH) provide the raw materials for bone density, scale strength, and the vivid coloration that makes these fish so popular. Bicarbonate (measured as KH) keeps the pH locked in the alkaline range their enzymes and immune systems are optimised for. Drop the pH below 7.5 and cichlids become stressed, lose colour, and become susceptible to disease. Drop it further and the biological consequences are severe.

If you're keeping cichlids in a soft-water area, you'll need to add minerals. Rift lake salt mixes are one option. Bottled water blending is another, with the advantage that you know exactly what's going in. The African Cichlids profile targets the overlap between Malawi and Tanganyika requirements, giving you a single blend that works for both lake types.