06-05-2010, 11:47 AM
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I am not an advocate of doing frequent water changes with cooler water, nor of floating ice/frozen water blocks in the aquarium. The reason is that it creates continual fluctuations, and while a degree or two might not matter, if it is more it can be stressful, more than the warmer constant temperature.
I now have an air conditioner, bought last summer as we had an unusual heat wave. But prior to that, for more than 15 years, I did nothing when we experienced a heat wave which normally last a few days to a week. The house temp was well over 90, but cooled down at night. I left the tanks alone. I lost no fish during any one of these heat waves. For less than a week I wouldn't expect you to lose fish--unless they are cool water fish of course. But normal tropicals will probably manage.
We often think that tropical streams are a stable environment in water parameters, including temperature, but this is far from true. It is the more sudden fluctuations that are hazardous, not gradual warmings and coolings as the fish experience diurnally in nature--or in the aquarium under these conditions. Keep the water moving to ensure adequate oxygen supply.