The Marina 8 Watt Heater is the perfect way to heat your glass or acrylic tank. Totally submersible and easy to conceal, its tiny size makes it perfect for your tiny tank or bowl. Feel free to use under gravel and run the heater as often as needed. Ensure optimum health of your turtle or tortoise by increasing your tanks water temperature by just a few degrees. Take a look at the selection of heaters at MyTurtleStore.com to find the right one for you and let us know if you have any questions.