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.
The gravel is dust free and is available in a wide variety of colours. For fresh water and saltwater aquariums. Colour: Purple. Size: 4-5mm (0.15in-0.2in ) Net weight: 450 g (1 lb).,
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