Coated Pebbles Aquarium Gravel is perfect for hobbyists with fresh and saltwater aquariums. This gravel features a unique and durable 100% acrylic coating that will not alter the chemistry of your aquarium water. The colorfast design keeps the colors on the gravel and out of the water - this color-coated gravel will not stain or dye your aquarium water. A safe and fun way to add colorful gravel to your unique aquatic seascape. Features grain size ranging from 3.1 to 6.3 mm.