I currently have a 14-gallon, 20-gallon and 55-gallon tank in my living room. With the warmer weather, the temperatures in my tanks seem to be getting a little high {towards 80 in each tank, a little higher in the 20-gallon}. The fish seem to be doing okay, for now, but I don't want to overheat and kill them. Currently, all the heaters are turned off and unplugged. The tanks are too dark during the day to keep the lights off... Any suggestions on how to cool them?