Our bro kanna chiller failed during the night and the lights are not running. Getting a cut off relay for the lights would not save his tank.
Maybe the artica or dailea a bit too costly for backup, a resun might be good too.
In the case of power trip no issue as you should already have a UPS to run a small powerhead to circulate the water Lesser heat load as well.
You could always go for the lower hp ones so they draw lesser electricity