Leaving everything off for 6 hours is not the same as having some basic things like a few air pumps going to oxygenate the water. What size is your system, generator & what's your current stocking level look like? I have two Pennplax battery operated air pumps on my system permanently in case there's an outage when I'm not around. They will cut in automatically through a small sensing relay in each one. If you're home during the outage there are a number of things you can do to minimize the impact. Remove some water, heat it on a gas stove or bbq if you don't have a gas stove & dump the water back in to keep the temperature up. The splashing will also help oxygenate somewhat. A car battery on a 1000 watt inverter can keep a skimmer or small powerhead going for quite a while as well.
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