So my heater for my 55-gallon tank is totally shot. I set it up early at the lowest setting and an hour later the temperature was at 78 and was still rising. The weather here has been really cold at night and I want to get a new heater, or two (one on each side). What would be a recommended heater that is wallet friendly. I only need the heater(s) during winter time because the rest of the year it's mostly above 90 F here. Thanks in advance!