Frozen Grey Tank
grangers sells a strip heating element that you can plug into the wall,they make them for heating 55 gallon barrels,you could wrap it around your tank,also rock salt will melt what ever ice thats in your tank till you can get some heat on it,if the ice expands an has no where to go,it will bust the seams on your tank or pipes.dont plan on comming to florida anytime soon,its below 50 here now.