Tropica Aquarium Soil PowderAquarium Soil Powder Aquarium Soil Powder ensures good and active growth from the beginning, and boosts the red plant shades. It is a complete bottom layer, which can be used without any other types of bottom layer. Aquarium Soil Powder is further an active bottom layer that lowers the pH value and slightly affects the water chemistry. The grain size of 1 2mm makes it easy for planting. This powder variety is best for foreground plants as it's smaller