Exo Terra Small Natural River Pebbles Aquarium and Turtle Gravel - 10 Lbs is a decorative gravel specifically chosen for aquatic turtle terrariums. These smooth, rounded stones are too large to be swallowed, making them safe for turtles. Turtle Gravel creates a natural-looking riverbed in your tank and also serves as a biological substrate to support beneficial bacteria. It enhances the tank’s aesthetics while helping to keep the water clean and providing a tactile substrate for turtles to explore. Available in Small and Large Pebble Sizes