To begin, I have a school of 6 endlers in a 5 gallon tank that finished cycling close to a week ago. Normally it is kept at 75-80 degrees Fahrenheit, but as of recently I have needed to replace the old heater because the cable was cut. It was an aqeuon mini heater, 10 watts. I have not been able to go to my LFS for two days. For the most part, I have been relying on the warm weather that my area has been having to keep the temperature up, but today was a colder day, so my tank has gone down to 72 degrees. I can't go to the LFS until later today, but what can I do to keep the tank warm until then? Also, should I be using a different heater for my five gallon? Thank you to all who reply. Also feel free to move this post if it is in the wrong place.