Ya I know I'm monopolizing the questions...but I'm want to buy a new heater for my 77g tank. I'm going to get the Won Brothers digital Pro Heat II. I'm just wondering if 250W would maintain a stable temperature or should I go with the 350W?
Theres a chart called "approximate heater guide". You should be fine with a 250W, unless there a big difference between the air tamp and the water temp. Good heaters from what i've heard.