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I have in water thermometers I'm bit concerned so hot last few days I know my fis should be 78-82 F I managed to have them let me put air on at 82 ....
Freeze some bottles of water and float them in the tank for a while to cool it down. This way you can do it without worrying about chlorinated water getting into the tank as you would with throwing ice cubes in there.
In your case, a fan blowing across the top of the tank may be enough to drop the tank to a reasonable temp.
It going down now an will keep goin down over couple days but I did nothin for them for a whole day and a half as heat went up from 80 to the high of 89