As to power outages, and how I've tried to address them:
-I bought an APC UPS (that's a brand of Uninterrupted Power System - basically a battery back up gernerally made for computers). The one I bought will run my circulation pumps for about 4 hours.
-Into this I plugged two battery powered air pumps. Penn Plax makes one that plugs in and will go on only after the power goes off.
So, if the power goes off, I have circulation pumps for about 4 hours. When they die, then the battery powered pumps kick on, and will generally last 8-10 hours.
-Finally, I bought a generator (I told my wife it was to run the refrigerator and freezer......lol). This whole setup allows me to run the generator during the day, and keeps the tanks going at night on the UPS and the battery-powered pumps (the UPS will charge off the generator the following day, the batteries in the pumps I'll have to replace, so I keep a bunch of "D" batteries around). I do it this way because generators are LOUD (unless you buy the really expensive ones, and I'm too cheap). If heating or cooling becomes an issue, I can change what I have plugged into my generator or the UPS.
-$500 for the generator (a 4500 watt)
-$100-$150 for each UPS (one for each tank)
-$7 per Penn Plax battery-powered pump
This certainly can sound like a lot of money, but when compared to how much I've already invested in my tanks, it's not really that much......
Kevin