Create a colourful aquascape in your aquarium with Marina Decorative Gravel. Marina Aquarium Gravel is epoxy-coated, which makes the gravel inert and prevents any adverse effects on water chemistry. Research shows that epoxy-coated gravel provides an optimum surface for the colonization of beneficial bacteria, which in turn provide biological filtration for clear and healthy water. Marina Gravel is dust free and is available in a wide variety of colours. Suitable for both fresh water and salt water aquariums. Epoxy-coated gravel safe for aquarium water Provides optimum surface for beneficial bacteria colonization Helps maintain clear and healthy water Dust-free For fresh and salt water 4-7mm Gravel size Available in other colours and sizes Marina Decorative Aquarium Gravel Purple 2kg Aquarium, Substrates.