Fins First provides beginners and hobbyists with affordable and dependable products to create a healthy and safe environment for their fish to thrive. Take the dive and choose Fins First! For freshwater or saltwater aquariums Substrates help simulate a positive natural environment ...Fins First provides beginners and hobbyists with affordable and dependable products to create a healthy and safe environment for their fish to thrive. Take the dive and choose Fins First! For freshwater or saltwater aquariums Substrates help simulate a positive natural environment for your fish, allowing for good bacteria to flourish Natural sand, will not alter water chemistry, non-toxic Use approximately 1.5lbs of sand per gallon of water