Hello all. Recently I have decided that I'm getting kind of bored with my fish tank. I love the fish don't get me wrong. But the tank is small and set up the way I like and I don't want to over crowd the tank. So I decided to up the anty. In a few weeks I plan to buy a 60 gal for another fw set up. I am new to the hobby. All I have ever bought were aquarium kits in the past. This aquarium comes with the tank itself, hood and florescent lighting. I know what I'm going to to for filtration and everything else but realize I over looked one thing. Heating. How much wattage do I need? I don't want to boil or freeze any fish. Also, I've read that some ppl run 2 heaters for larger tanks. Is that necessary?