I may set up another 20 gallon. I have a 100w Eheim Jager in my 20 gal shrimp tank and am unimpressed with the need to calibrate it and its inaccurate heating. In my smaller tanks I have a mix of Tetra and Aqueon presets that work all right but for a big tank I don't want a preset heater. What wattage and brand can y'all recommend? Something cheapo preferred.