For optimum aquascaping use 2 lbs. of gravel per every one gallon of water. Instructions: Rinse well in tap water to remove loose particles before use. Do not scrub or rub together. Do not use soaps, detergents or bleaches. Suggested uses: Create your own unique aquarium environment using one or more colors. Natural underwater settings can be recreated by combining various colors or textures. Enhance the depth of your outdoor goldfish or koi pond with colored gravel, gradually using lighter colors at the edges and darker colors towards the greatest depths. Use natural color tones to help disguise man-made pond edges and containers used for water gardens. Terrariums: Create interesting landscapes and attractive habitats for reptiles, amphibians and small animals.