Create a colourful aquascape in your aquarium with Marina Decorative Gravel. This epoxy-coated gravel is inert and will not adversely affect water chemistry or harm fish. It also provides optimum surface area for the colonization of beneficial bacteria, which in turn provide crucial biological filtration that creates clear and healthy water. The gravel is dust-free and easy to maintain. Available in a wide variety of colours. For fresh water and saltwater aquariums. Size: 4 to 7 mm (0.15” to 0.3” ). Net weight: 2 kg (4.4 lb).