The Central America Rocky Lake Environment consists of both the region’s deep-water lakes, as well as the rivers, which flow from them. These lakes are extremely rocky and contain steep sides. The water is hard, alkaline, and cooler due to its depth. The rivers have similar conditions at their source, but they gradually pick up decaying plant material from side streams making the water slightly acidic. Large grade dark brown to black gravel is recommended to recreate this niche.