Fitting most standard rectangular tanks up to 55 gallons, the One & Only Turtle Topper By Penn Plax is a creative and unique basking spot for your turtle. As it is designed to sit on top of your turtle tank, this enables you to almost completely fill your tank with water. Your turtle will love the deeper water, especially since the water will stay cleaner for a longer period of time. This deeper water will also enable you to use any filter of your choice, especially those that wouldn’t normally work in lower water levels. In addition to this, since the Turtle Topper is supported by the top of your turtle tank, it can hold multiple or larger turtles without sinking. This topper comes with adjustable suction cups to fit tanks of different sizes and is designed to be used with two 5.5” clamp lamp fixtures (not included). Dimensions: 17” x 14” x 12”.