Amazonas World Aquarium Gravel

River gravel is a natural product and free of lime. The stones are rounded and are available in four grain sizes. Rinse before use. The substrate can be designed with sand, gravel, or a mixture of both, taking into account the needs of the fish. The average gravel should be rounded and have a grain size of no more than 2-3 mm. A gravel layer of 6-8 cm is recommended to allow plants to develop sufficient roots. Amazon gravel provides a suitable and natural substrate for all fish species and their habitats. You can calculate how much gravel you need for your aquarium using the following formula: (length x width x gravel height x 1.6).