I usually keep my tank between 79-82 degrees. A few things you can do is to float 2L bottles about 3/4 full of frozen water in the tank, or what many of us do have a small fan or 2 blowing across the top of the tank, computer fans work great if you have any wiring skills or one of the small clip on style from the local store. The only problem with the fan is it is going to increase you evaporation loss so you are going to have to stay on top of your top-off schedule, or ATO or whatever you use
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