they stabilise water parameters (pH and carbonate hardness) and keep them at levels that are optimal for shrimp and plants they stimulate the growth of plants by supplying all the essential nutrients to their roots they enhance the biological filtration of water in the tank by providing a perfect habitat for beneficial nitrifying bacteria they have unique decorative qualities: against the natural dark background of the substrate, shrimp and plants are clearly visible and look astoundingly beautiful they are effective and long-lasting: thanks to the gradual release of nutrients, the substrates do not require frequent replacement and retain their properties for a long time