Pure Water Pebbles Aquarium Gravel, 25-Pound, Black Frost Pure Water Pebbles Premium Freshwater Substrates Natural Decorative Gravel 100% Acrylic Coating, Colorfast Non-toxic, will not alter the chemistry of your aquarium water Recommended Uses: Fresh & Saltwater Aquariums, Ponds, Terrariums, Gardens, Potted Plants, Vases, Ash Trays, Crafts & Hobbies