So the tempature here in atlanta dropped so we havent been using the ac any longer over the summer the temp on my tank was 77-77.8 around there well today i checked my temp and it dropped to 75 i use two 200w heaters to heat 175g 150g tank and 25g sump the temp on each heater i just checked i had set to 78 so i cranked them both up to 80 is this enough heat to maintain this water volume or should i consider other options?