My little heater in a 10 gallon tank is not terribly reliable. Even if I turn up the power the tank temperature will drop many degrees on a cold night. Now I'm headed out of town for a few days and the heat for my house will only be on very low. I'm worried that my fish will freeze or that my heater will get over worker and die or explode. I have no idea what brand the heater is. So, does anyone have any heater recommendations?