This red clay is perfect for hard, hard-sided medalas with bacteria that are perfect for medala. The volcanic ash soil produced in Kanuma is hard granulated and formulated with live bacteria. This is an Akadama soil dedicated to making water suitable for medaka. Living bacteria breaks down dirt such as droppings and maintain clear water. Due to the nature of Akadama soil, it removes harmful nitric acid from the meda, and stabilizes the water quality for a long time, reducing the hassle of changing and cleaning. Hard granulation, so it is hard to fall apart and will last a long time. Since it does not have nutrients that can cause moss, it is difficult to grow, reducing the hassle of cleaning. How to Use: Use as a bottom sand for aquarium fish.