Radicaljbr, lol, I'm no expert, but, On my reef I use a finnex 500 watt titanium heater with 0800 controller. I had it less than 1 year and the controller went bad. The company replaced it at no cost. So far (knock on wood) it's been fine. I have 2 200 watts Eheim-JAGER TS glass Heaters on the FO tank. I tried the 2 jager heaters on the reef but I could never get the temperature stable for some reason. I also use a pin point probe to keep track of both tanks.