So I've had my 55gal tank set up for about 3 weeks now and have maintained a steady temp of 77 degrees 'F since the 3rd day, the first night i practically boiled my tank at 86+ degrees F, so i cranked my 200w submersable All Glass branded heater down to 71 which resulted in my steady tank temp of 77 'F.
My question is this. Is there some sort of calculation that you need to do to determain at which temp to set the heater at. I would have assumed you set it to the temp you'd like the tank water to be, and the heater would maintain that, or is it just trial and error. My Heater placement is to under the waterfall of my HOB