Onyx Sand™ is the ideal substrate for any type of aquarium environment; whether you have reef, planted marine, or freshwater planted aquaria, this naturally black sand will perfectly complement and enhance the appearance of your tank. Onyx Sand™ provides not only iron and other minerals but supports optimal KH levels for freshwater planted aquariums. Onyx Sand™ is most effective when used alone as an integral substrate bed, but it may be mixed with other gravels or sands. Gravel modifiers are not necessary. Onyx Sand™ is not chemically coated or treated but does have a slight buffering capacity. Also available as a gravel.

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