I have a 200 gallon tank that I am wanting an inline heater for. The Hydor ETH In-Line Heater was recommended to me but will just 1 of these heat up the water? I need the water to stay around 78F and the room the tank is in stays around 70F. I have an EHEIM Professionel 3 model 2075 canister filter. Or if you have any other suggestions for inline heaters I am all ears. Thanks!