【Natural and Realistic】Thoreau sand comes in naturally understated light grey, brown, dark black, white, and a distinctive light blue color. When wet, the sand is more layered and saturated, perfectly replicating the clear riverine bottom sand bed and natural ecological ambiance. 【Natural Aquascape】In aquascaping, Thoreau sand can be used as a substrate to create the effect of natural environments such as river beds, waterways, and beaches. Its natural, understated color and texture accentuate brightly colored freshwater fish well and create a natural aesthetic. Pair with other landscape stones and aquatic plants to create a visually feast-like natural environment. 【Multiple Landscape Use】Good choice for decorative sand in terrarium, aquascapes, and reptile tanks. Its unique natural colors and textures replicate the original terraces or palaces of lizards, turtles, and other reptile habitats, providing a comfortable and aesthetically pleasing substrate for them to rest and move around. Maintain a clean and hygienic living space for your beloved pets. 【Stable Water Quality】Help break down organic waste and reduce harmful substances in the water, such as ammonia and nitrite levels. Its granular structure is rich in pores, which effectively adsorb and store water and nutrients. These pores can also provide a habitat for beneficial microorganisms to inhabit and reproduce, reducing the concentration of harmful substances in the water and promoting the self-purification of the water body. 【Size Specification】Large grain size: 3-5mm. 2L per bag, about 7lbs. Larger grains of sand can be mixed with other fertile substrates to provide aquatic plants with the necessary nutrients and support. It can be combined with large stones, rocks, and water plants to create a natural river and marine ecosystem. Size M,2Lx1pk(7lbs) Brand Name LANDEN Item Weight 7.09 pounds Manufacturer LANDEN Item Dimensions LxWxH 11.42 x 7.09 x 2.17 inches Target Audience Keyword fish Item Package Dimensions L x W x H 11.14 x 8.15 x 2.87 inches