For the image of red earth baked by the burning sun, and for the drama and energy of Central Africa in your aquascape. AQUA SOIL SERIES A high pH level (alkaline) of the substrate causes difficulties for aquatic plants in consuming nutrients. The Aqua Soil Series decreases the hardness of the water and lowers the PH level to the degree at which most aquatic plants can consume nutrients and comfortably grow. Aqua Soil granules maintain their shape and density for long periods underwater securing good circulation of water and oxygen through the substrate. With Aqua Soil, growing difficult plants such as Tonina sp. becomes easier, and it is ideal for fishes demanding soft water.