The temperature in my den has been rising during the past week or so with rising temps outside. And it is not even hot outside yet. My tank is getting to 82 F with the top open and a fan blowing on it. It is a 9 gallon tank and the evaporation with the fan on is one half gallon per day. That is 5% of tank volume resulting in a BIG salinity change everyday. I think the answer is a tiny chiller. But it will have to be inside the tank as I have no outside tank filtration. Anyone have any ideas?