Ok here is the situation. My family's electric bill comes every month and it has been pretty high. I have 4 tanks(10,55,40,125), four 300 Watt heaters at 82 degrees, two canisters and two hanging filters. The heaters are probably on 15 hours a day because I live in a relatively warm area. How much should my dad be spending for the tanks running? He keeps blaming the high costs on the tanks. Thanks for your info.