Right now in my office I have a 2 gallon planted tank and I was thinking about getting a betta fish to put in it. I have a heater laying around so I'm not worried about the winter or the air conditioning, but it may get to hot. On the weekends, when they turn off the AC, the temp in the room can easily get up to 100F in the summer. I was thinking that I could buy a fan and put it above the water for cooling on weekends but I don't know if this cool enough to keep the water below 84ish? The temperature does only get about 100F for saturday and sunday on the weekends so its only two days out of the week. What do you guys think? Or do you have any other suggestions on how to cool a 2 gallon planted tank on the weekends to make it betta inhabitable.