In response to AquaJern's originally expressing an inability to afford a chiller, I would just say don't underestimate fans. Evaporative cooling reigns supreme, and 1 or 2 fans can make a big difference.
I don't freak out when my tank gets warm, but I don't let it get much above 80 either. Mostly because I want to keep away from danger, and I know that low 80s is fine.
I was running a fan at one end of my tank, but still had to run my home A/C more than I would have liked to keep the tank under 82. I added a 6" fan to the other end in addition to the larger fan already running, and my tank cooled 2 degrees from that alone.
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