Seachem Onyx Sand Freshwater Substrate - 15lb

Seachem Onyx Sand Freshwater Substrate - 15lbOnyx Sand is a porous clay gravel for the natural planted aquarium. Being carbonate rich, Onyx Sand provides an advantage to any plants able to utilize bicarbonates. Onyx Sand is most effective when used alone as an integral substrate bed, but it may be mixed with other gravels. Gravel modifiers such as laterite are not necessary. Onyx Sand is not chemically coated or treated and will not alter the pH of the water. Although pre washed, it may be