06-27-2012, 04:18 AM
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If you don't have a lot of circulation in the tank, I personally would use two 100W to heat the tank equally. For example, I have a lot of flow in my 75 g, 4 ft long, and I am just using a single 300W at one end....
I would not recommend TopFin because the thermometer sucks and doesn't always show the correct temperature on it. I would recommend Marineland, a bunch of them have three ways to read the temperature, and come with a nice warranty.