Perfect New Fish Tank Aquarium Submerible Heater Glass 500w Adjustable Temperature 18-34C with 2 Suction Cups Fresh Water or Saltwater Perfect New Fish Tank Aquarium Submerible Heater Glass 500w Adjustable Temperature 18-34C with 2 Suction Cups Fresh Water or Saltwater Totally submersible; Easy and precise setting of desired temperature Thermometer-style temperature indicator is easily visible Sensitive and reliable thermostat maintains uniform temperature, protects against running dry Made of shock resistant and shatter proof glass for fresh or marine water