【Natural Style Landscaping】 It can be used as aquarium substrate sand and aquascape make-up sand to simulate the atmosphere of the natural river bottom. The aquascape is versatile and perfect for the native aquascape type of aquatic environment. It can be used with dark-colored plants, rocks, wood, etc., to form a natural and realistic environment. You can also try black water aquascape and tropical rainforest aquascape. 【Increase Ornamental】 The color deepens after entering the water and will look more profound, increasing the sense of space inside the aquarium and making the aquarium look more spacious. It is suitable for highlighting the color and form of the aquascape and used with other decorations to create various atmospheres, such as jungle, wilderness, etc., to increase the ornamental value of the aquarium. 【Suitable for Feeding Benthic Organisms】 Provides a better-growing environment for benthic organisms. Suitable for sinking fish, such as small bottom-dwelling fish, fatty carp, catfish, etc., because of its simulated river bottom atmosphere. The dark color absorbs heat faster and makes your fish warmer. Aquatic plants suitable for riverbed environments, such as prickly lily, willowherb, etc., can be matched in riverbed aquascape to add a sense of nature and layers. 【Improve Water Quality】 It helps to regulate and purify water quality. The surface has many micropores with adsorption properties, which can adsorb harmful substances in the aquatic environment. The organic matter in the sand can be used as a carbon source to promote the growth of aquatic plants. The microorganisms and bacteria on the surface can also provide help to the ecosystem in the aquarium. 【Naturally Sourced Materials】 The material is taken from the natural riverbed without pollution, retaining its natural color and rough texture without any chemical processing. After layers of screening and high-pressure cleaning, brown and black mixed color is the primary, uniform particles, irregular shape, diameter of 2-5mm. Suitable size, easy to clean, not easy to accumulate waste in the aquatic environment, keep the water clear. Vacuum packed, each bag weighs 3.2kg, about 7lbs. LANDEN Aquarium Mekong Sand The brownish-black Mekong sand is a darker-colored, rougher textured sand, usually used for aquascaping in aquariums, and is suitable as natural sand for general aquarium substrate or aquascape layout makeup sand. It is ideal for a native aquascape type of aquarium environment. It can be used with dark-colored plants, rocks, wood, etc., to form a natural and realistic environment. The brown-black Mekong sand also allows fish and other aquatic organisms to hide in the water, better simulating their natural habitat. It can be used in various landscaping styles, such as black water landscaping, tropical rainforest landscaping, etc. Medium-grained Mekong sand of 2-5mm can create natural riverbeds and simulate underwater environments. It has a moderate settling speed, does not readily disperse, and provides a suitable growth environment for benthic organisms.