Aquarium HeatersA quality heater is necessary if you intend to maintain a successful tropical freshwater, marine fish or reef system. Temperature fluctuations often go unnoticed by aquarists and can cause stress to fish and corals. Most heaters include a built-in thermostat to select the optimal temperature for your aquarium.
50 Watt Submersible Quartz Heater. Maximum strength quartz silica tube Which is shatter resistant & more durable than conventional glass heater. "Easy set" thermostat provides precise and accurate thermal control. Includes gravel ...FROM ONLY$17.31