Gravel Dark Fine, i.e. dark gravel, is a natural substrate for the aquarium. It is 100% safe gravel which, due to the fact that it does not change the water parameters, can be used in any aquarium. Fine gravel with smooth edges, regular shape, repeatable grain size and unique dark colors. Shades of brown, gray and beige interpenetrate each other, creating a unique scenery in the aquarium. The size of the individual gravel grains ranges from 1 to 2 mm. The gravel is devoid of sharp edges so it does not injure the fish and is ideal for fish in the bottom zone. It is recommended to wash the gravel before use.