I noticed that my water is getting hot, (about 80 F) which might be one reason my fish are dying. My house is warm but I can't say it is severly hot...It was 77 F in the house and 80 F in the tank yesterday. I turned the lights off and put some ice in a ziplock bag and floated it in the water to help try to bring the temp down. Anyone have any ideas about why the temp is so high. Should it be more than the room temp? Any suggestions about chillers, since price is of some concern here.