Create a colourful aquascape in your aquarium with Marina decorative aquarium gravel. The gravel is epoxy-coated, which makes it inert and prevents any adverse effects on water chemistry. Research shows that epoxy-coated gravel provides an optimum surface for the colonisation of beneficial bacteria, which in turn provides biological filtration for clear and healthy water. The gravel is dust free and is available in a wide variety of colours. For freshwater aquariums only. Colour: Black. Size: 4-7mm. Net weight: 2 kg.