Produced from unpolluted natural riverbeds, thoreau sand has a very soft and distinctive color, which deepens in saturation and contrast when immersed in water. Its very homogeneous and refined grains make it suitable as a substrate for aquascapes, perfectly replicating the original landscape of rivers and streambeds and creating a unique natural ecological atmosphere. Its adaptability and plasticity make it ideal for matching flora, fauna, rocks, and decorations to create distinctive landscapes. 3-5 mm large-grained thoreau sand is suitable for simulating riverbed and streambank scenes. It can often be combined with large stones, rocks, and aquatic plants to create a natural river and marine ecological environment.