Heat waves make this a challenge. Got home yesterday and the tank was 83. Took off the lid and blew a fan across the top of the water for the evening. Got it down to 80. House didn't cool off at all overnight. Woke up and tank was like 86! Not good at all. Blew the fan again in the morning until I had to leave for work. Back down to 82. Scared to see what it will be when I get home. Octos should never be above 82 from what I've heard but I don't want to leave the lid off and the fan blowing while I'm not home do to a possible escape. Just curious as to how much heat your Octopus has had to endure......