Finnex HMA 300w Electronic Controller Aquarium Heater Titanium Tube Heater Guard salinity conductivity probe The titanium tubes are corrosion blennymidas The titanium tubes are corrosion resistant which makes these virtually unbreakable for both saltwater and freshwater aquariums Well known and successful aquarists worldwide often say that two of the key components to a great reef aquarium are lighting and flow The Finnex Compact Electronic Titanium Heaters maintain water temperature within + 2ºF of the set value providing a safe These ultra fast heating tubes are easy to hide as they are compact in size and also include a precise electronic control with hang on hook