I agree with the rest.....BTW, if there is a power outagge how are you on the internet?
Beside the point. I would prepare for next time, by buying a UPS, just run your phs off of it, a heater would suck up the juice way too quickly. With the pds going, you will at least get some O2
into the water. Depending on the tank, the room and location, it can take a while for the water to cool down enough to cause problems. Definitely think about wrapping the tank with towels or some other insulation, to keep the temp up as long as possible. Other option might include heating some water via a gas stove, butane/propane grill and add to the tank a little at a time...That might not be the best solution, but it could work in a sticky situation. Just remember, don't go dumping a bunch ot boiling water into your tank.