Our Repti Rapids Waterfall is a natural looking, tranquil sounding waterfall for terrariums 15 gallons or larger. Adds beneficial humidity to your reptile terrarium which is essential for all high humidity tropical type reptiles. Made from Foamed Urethane, which is more realistic looking than plastic or painted cement. Large capacity water reservoir – won't run dry overnight. If water reservoir does run dry, simply pour water into reservoir and waterfall will start back up. Includes Zoo Med's Micro Pump 104, which can run dry for 30 plus days without any damage to the pump.