Been having an issue with my heater being unable to get my tank to the temperature I require I believe because my basement gets cold. It is set to 82 for my FH and has only been to 78 and runs constantly. It is a 150w Aqueon heater for a 55g tank. I need to know if it is advised to run a second 150w, a bigger second heater or a single large watt heater. Any info/advice is appreciated.