Reptology Internal Filter 70Reptology Internal Filter 70 helps provide crystal clear water for turtle tanks and terrariums. It has an adjustable and directional water flow with activated carbon to remove chemicals, toxins, and odors, and keep your tank looking its best. The two stage filtration features a lower foam and an upper carbon chamber and the large capacity filter cup and internal sponge promote beneficial bacteria. For fish tanks up to 15 gallons in sizes this filter