To use this aquarium gravel, first, rinse it thoroughly with cold water until the water runs clear and there's no debris or color left. Never use soap or detergent. When filling your tank with water, place a saucer on the gravel and pour water onto the saucer. This helps prevent the water from disturbing the new gravel. Once your aquarium is up and running, use a gravel vacuum for regular cleaning. Be careful when choosing gravel for your fish. Some fish are better off with sand or a bare - bottom aquarium, and gravel can be a choking hazard for certain fish.