We have been having electric problems and for some reason our heat has stopped working and our hot water isn't working, so can I use the heater from my 20g (50 watt heater) and put it in the 2.5g and put it on a temp to where it will heat the tank to 78 using thermometer? Right now in the apartment its already cold and I'm sitting here in a jacket and sweats. Its getting cold in here.