Desgined for planted aquariums and aquascaping, Controsand by Ultum Nature Systems is a natural substrate blended for freshwater aquariums and terrariums, Controsand is safe for fish/invertabrates/reptiles. Controsands can be used alone or in combonation, layered to create different scapes. Monterey is a beautiful gravel featuring a mixture of neutral tones. Monterey can be used alone or paired with a fine natural sand to create a customized blend. Monterey is ideal for adding extra detail and for aquariums that require larger granules.