Help: Cool off tank

[powerboy]

i dont have a chiller, but heres what i do to keep my tank temp regualted. i fill up milk jugs with water and put them in my deep freeze. i usually have anywhere from 4-6 ready and all i do is drop one in the sump and wait until its thawed, and repeat process. this method allows my tank to never creep higher than 82 even in the hottest weather.
along with evaporative cooling (which it seems you have) it works quite well.

good luck, hope the tip helps you