Carib Sea SCS20730 Reptiles Calcium Substrate Sand, 20-Pound, Rainforest Green Ideal for true chameleons or any tortoise, snake, lizard, arachnid or insect that comes from an arid or semi arid environment Made of aragonite, the most soluble form of calcium carbonate Features 100 percent edible, easily digestible and naturally spherical grains that will not scratch valuable animals inside or out Contains strontium and magnesium while being free of silica and phosphates Available in rainforest green color; it weighs 20-pounds