Hi I have 120 gallon set up. I have my Ink bird set to T1 78.0 and T2 77.5 I have two 300W Titanium Heater Elements on it and it is running 24 hours. According to BRS website 600W should be able to handle up to 200 gallons. now during the day when I'm working i let my house go down to about 60 degrees but the tank even when i'm home and i have the heat on 72 this system never hits 78. Anyone have suggestions of why this is?