Zoo Med Turtle Clean 318 Submersible FilterGreat for turtle tanks! Zoo Meds new Turtle Clean filter 318 is great for aquatic turtle tanks (up to 30 gallons) or for filtering box turtle ponds or aquatic amphibian tanks. Filter is fully submersible with easy to change filter cartridges. Dual intake ports to help prevent clogging from debris. Comes with activated carbon and biological filter sponges.