5KG Bag Fine Coral Sand, 1mm grain size approx Excellent grade fine Coral Sand for marine or hard water type set - ups. Also used in Lake Malawi set ups. Corals Sands and Gravel are suitable as an aquarium substrate or as a filter media due to the high surface area for biological and mechanical filtration. Please note this product will raise pH and hardness so can only be used in Marine Aquariums and other high pH type freshwater set-ups. If in doubt please ask
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