Hey all. I just got a heater for my 2.5 gallon today. Its a small paddle heater with no thermostat. According to the box it is designed to increase the temp of a tank about 5 degrees. Well, my average tank temp for the past week has been 73. It was getting a little low due to the cold weather so i figured i would go get a heater. I put the heater in and plugged it in and all seemed to be fine. The temp started climbing (very slowly). Right now it is right around 80. From what I can tell, however, it doesnt seemed to be stopping. its reaching over the 80 degree mark and Im concerned with how high it will go. I just plugged it into a timer to have it go on and off in 30 minute intervals to hopefully level the temp. What is the max temp that I should allow this to get to? I have my eye on a few heaters online right now that have preset thermostats at 78 degrees. Any one have any heaters they like that work for a 2.5 gal?