Be sure to choose the appropriate size for your aquarium.
• For use with aquariums between 1 to 10 gallons
• 7.5 Watt works best for 1 to 3 gallon fish tanks
• 15 Watt is best for 4 to 10 gallon fish tanks
• Can be used with glass or acrylic enclosures
• Warms aquarium water up to 6°F above ambient room temperature
• Suction cup included for mounting to aquarium