Marina Decorative Aquarium Gravel Grey Tone | Fish Tank Substrate\nCreate 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.\n\nMarina Decorative Aquarium Gravel Grey Tone | Fish Tank Substrate\n\nCreate a colourful aquascape in your aquarium with Marina Decorative Gravel.\n\nMarina Aquarium Gravel is epoxy-coated, which makes the gravel inert and prevents any adverse effects on water chemistry.\n\nResearch shows that epoxy-coated gravel provides an optimum surface for the colonization of beneficial bacteria, which in turn provide bioly