- Joined
- Dec 19, 2017
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Were it me I'd get a stand alone 300W heater with it's own thermostat, and set it to about 2 degrees cooler than what your current heater is set at. I would keep it completely separate from the controller. This will ensure that you do not have "dueling heaters". The backup will only turn on if your primary fails and the likelihood of both of them being stuck on at the same time is extremely small. I agree that the primary 500W may be a little strong/risky for that tank.