To use Fish Gear Gravel, first rinse it thoroughly with cold water until the water runs clear and there's no debris or colour. Never use soap or detergent. When filling your tank with water, place a saucer on the gravel and pour water onto the saucer to prevent the water from disturbing the gravel. Once your aquarium is up and running, use a gravel vacuum for regular cleaning. Also, choose the right gravel for your fish. Some fish are better off with sand or in bare - bottom aquariums, and gravel can be a choking hazard for certain fish.