04-23-2013, 02:43 PM
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you can take a 1 liter bottle, fill it 2/3 full of water, freeze it, and then float it in your tank. as it thaws, it will cool the surrounding tank water.
i also live in phoenix, and in the summer it sucks being a fish tank owner. doing water changes takes a lot more ingenuity. for one, the water temp out of the tap can reach 85-90 degrees on the cold setting, much too warm to add to the tank, which is around 79-81 in the summer already. so i used to use the frozen bottle method to cool my new water, before adding it to the tank. but that could take 20-30 minutes for each 5 gallon bucket. then last year, i got a little smarter, and just started refrigerating 2-3 gallons of tap water the night before i was to do water changes. then the next day, i mix the right amount of warm tap water, with the 40 degree refrigerator water, to make my 79 degree tank water.