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. Tahoe is a rounded pebble gravel designed for freshwater planted tank use. Its neutral color palette is versatile and makes it suitable for a range of popular aquascaping styles. Tahoe works well alone or combined with other cosmetic sands to create a custom blend for the aquarium, terrarium, paludarium and more.