The soil has become a popular substrate option these days, particularly for aquascapers and shrimp keepers as its size, structure, dark color and shape offer a striking natural canvas in an aquarium. Soil substrates are produced by means of a special manufacturing process that involves high pressure and heat, and that converts mineral-rich volcanic soil into lightweight, granular, voluminous substrates. Soil helps to support conditions that all aquarists hope for: crystal clear water and an abundance of lush, healthy plants!