JBL ProScape Volcano Mineral is a highly porous volcanic rock and ideally suitable as a basis for every natural aquarium. The porous volcanic rock ensures the water circulation at the bottom of the aquarium and also helps supply organic plant nutrients to the plant roots. With its open-pored structure JBL ProScape Volcano ensures an optimal oxygen supply to the bottom of the aquarium. This encourages microorganisms to settle, making the substrate an efficient biotope. JBL ProScape Volcano Mineral is rich in minerals like calcium, magnesium and potassium as well as in trace elements like iron, boron or manganese. It is thus a natural supply of many substances necessary for plant growth.