Keep your fishy friends completely comfortable with the Penn-Plax Aquarium Heater. This LED display heater lets you set and maintain the perfect water temperature for your fish. The warm-tone display makes it easy to see and monitor the water temperature. It features a reliable and sensitive adjustment dial that allows for a temperature range between 61 and 90 degrees Fahrenheit. It’s designed to be fully submersed and can be placed in your tank horizontally or vertically. The heater’s electrical components are also contained in a high-quality quartz tube for protection. It’s a great option for both fresh and saltwater fish pals with very particular temperature needs!