Give your favorite terrarium-dweller the freshest water with the Penn-Plax Internal Aquarium Filter. This internal filter helps provide crystal-clear water for your turtle tank or terrarium habitat. It features a two-stage filtration system that’s designed to provide both mechanical and biological filtration. It includes an optional spray bar and six inches of airline tubing for aeration. This filter is ideal for tanks up to 50 gallons—and provides great benefits for your water-loving reptiles!