Well the lady when we got it said that a 300watt for our 50 gallon would be good because it wouldnt have to fire as much. Anyway this was fine eventhough I had to set it really low it stayed at about 78. Well then I added a maxi-jet 1200 and the temp will not go below 81 and its turned all the way down. Is there anyway to avoid buying a smaller heater? I plan on putting another 1200 in there also wich i am sure will bring up the temp even more. Im kinda irritated about this. TIA