Do you recommend robo, dwarf or fancy?
I remember in 2004 when the power went out in Memphis in the middle of the summer for 3 days. I floated bags of ice, manually stirred water, changed water to keep everything alive. Things were going well then the power turned on and all my fish were dead. I forgot that the water in the sump went stagnant and bam instant ammonia spike. Sad day, happy to have power but the SPS slowly faded and the only thing that survived were my softies and LPS.
Chalk that up to another tough lesson learned in this hobby. Even though I have a nano now, it is still not worth the heartache thus the generator investment. I can imagine winter would be harder than summer. Last winter my partners in my practice were out power for three days and me for one which could mean death throughout my tank.