Yes!!! if the power is out for more than 48 hours, I would maybe change ALL filter media before it comes back on. All the bacteria are presently dying without the water moving through them...you may want to float your biological media in the tank...otherwise, if you don't act, when it comes nback on you may dump a ton of harmful dead bacteria into your tank. I survived a 6 day outage during IKE. battery pumps kept it oxegenated. I wrapped blankets..about 4 around each tank to keep them from dropping too low. you can go and get a autombile voltage converter from the store. it plugs into your cig lighter, and you can plug stuff to it. you'll have to use and extension cord. plug in only the heater!!! the cord greatly reduces the load that it can carry....you'll have to run your car off and on...but for the good of your livestock....i'd do it for sure. buy the best one you can find.