Okay, I've dealt with a couple of prolonged power outages on FOWLR tanks, so I hope my advice will help. Instead of messing around trying to make current, you need to cover the tank up with towels, blankets, whatever to insulate it against the cold. If you have some sort of heat source, like a fireplace or propane space heater, that will help. Don't worry about feeding or keeping them in the dark; fish can handle this for a while. The first time this happened to me, the power went out for four days and all the fish in my 20 gallon survived. The second time this happened, which was last December, the power was also out for four days and I lost all but one of the fish in my 29 gallon, probably because it got much, much colder. So in my opinion, your biggest concern is keeping as much heat in the tank as possible. Now, I've never had to deal with corals when this happens, but if they can survive being stuck in a shipping box for a day or two, I'm sure they can survive a power outage for a while without light, current and filtration.