The Titanium Finnex Heaters are corrosion-resistant, extending the life exponentially from saltwater damage. Virtually unbreakable, especially in comparison with the standard glass aquarium, these tube are built to last. The ultra heating titanium further provides a stable temperature environment for your aquarium lives and eliminates temperature swings that put stress on the aquarist's live stock. This titanium heaters are suited for both use in fresh and salt water aquarium. The heater is ideal for aquariums between 40 and 80 gallons in size.