Do you have a point?
Yeah, my point is that you probably won't know for sure how many watts total your tank is using every day because the heaters come off and on multiple times every day. If you're in places like Chicago or Wisconsin that are really cold right now, I could see that your heater would be on all day, but for someone in Florida or even someone who's heating their house at a decent temp, that won't be a problem. I run 3 tanks all with 300W heaters -- a 210G, 240G and a 10G quarantine tank and my total electricity bill is usually $70 a month. If all 3 of my tanks' heaters were running all day, my bill would be a lot higher than that.