Onyx Gravel ™ is a specially fracted porous substrate for the aquarium. Onyx Gravel™ is suitable for any aquarium environment including reef and planted aquariums. Onyx Gravel™ 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 Gravel™ is not chemically coated or treated but does have a slight buffering capacity. 5-10 mm average size |
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