Pour Black Earth directly onto the bottom of the aquarium. The substrate layer should be at least 1-2 inches thick to allow plant roots to fully grow. Place and arrange decorative rocks and driftwood. Carefully add water. To fill the aquarium with water, first place a large plastic bag or newspaper on the soil surface to prevent water from impacting and stirring up the substrate. Slowly add water and take care not to disturb the substrate layer. Planting can be easily done when water is slightly above the substrate level. Package included: 5litre. Aquarium Soil naturally reduces your KH and pH value and enhances the ability of the plants to absorb nutrients. Aquarium Soil ensures good and active growth from the beginning and boosts the red plant shades and is a complete substrate, which can be used without any other types of bottom layer. Aquarium Soil is further an active bottom layer that lowers the pH value and slightly affects the water chemistry.