Equipment
Eheim Jager Heater Review: The Bulletproof Reef Heater
An overview of the Eheim Jäger glass aquarium heater and why heaters are best run with a backup controller.
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The Eheim Jäger is a long-established glass aquarium heater with an adjustable thermostat, and a common choice for saltwater tanks.
Running it safely
Any heater can fail. A common precaution is to split the heating between two smaller heaters and to plug them into a separate temperature controller, such as an Inkbird, as a backup.