Start your reptile tank off right with CaribSea Blue Iguana Reptile Calcium Substrate. This calcium substrate is a great conductor of heat and ideal for desert-dwelling snakes, lizards, tortoises, insects and arachnids alike. Aragonite sand contains nutritionally available calcium, and while not intended as a food source, is safe to ingest and helps prevent uncomfortable scratches inside and out. The dust-free formula helps prevent inhalation and won’t make a mess during setup. Contains no artificial dyes. This is also great for use with Tortoises, Invertebrates, Lizards, and Snakes.