TROPICA PLANT GROWTH SUBSTRATE is long-term storage of nutrients, providing plants with healthy and rapid growth. Plant Substrate is a natural concentrate of clay and moss to position at the bottom of the aquarium during its installation. Clay and moss slowly release nutrients into the roots of the plant and also absorb excess nutrients from the water releasing them into the roots of plants. Absorbing nutrients from water into the lower layer of the substrate and absorbing them through plant roots reduces the risk of algae. Therefore, using the substrate makes it much easier to keep the aquarium with plants.