If your turtle tank is filled half way and is 10 to 30 gallons in size, the Tetrafauna Repto Filter 90 gph is for you. The innovative Whisper filtration technology removes debris, discoloration, odors, ammonia, and provides three-stage filtration for your turtle tank – up to 20 gallons of water. Use the ReptoFilter to create beautiful waterfalls in shallow-water environments. Your turtles will stay out of the filter chamber with the top lid, while still enabling you easy access to replace the medium ReptoFilter cartridges. Product Dimensions: 4.2 x 3.9 x 8 inches.