05-06-2012, 11:54 AM
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I agree with those who advise not to keep fluctuating the temperature with ice and water changes.
During the summer, admittedly not as hot here in Vancouver for so long as it would be in Arizona, my fish room never gets below 80F in the day so naturally (as AD said) the tanks will be the same. I have a portable air conditioner that keeps that room no higher than 80F. The fish will manage, and it does cool down a bit at night of course.
There is more variation in the tropical regions with respect to temperature and pH of the water than many realize. But the changes are not sudden (like the water change/ice issue would be). For the short term the fish adapt. They will have a higher rate of physiological activity of course, requiring more oxygen, so other considerations should be taken into account: don't feed as often, ensure a stress-free environment (no shocks to the fish), etc. No new arrivals to risk disease that will highly stress the fish. Ensure good water circulation and surface disturbance can be increased to keep oxygen in the water.
In other words, just as humans like to do on hot days, take it easy sitting in the shade with a cool drink. In fish terms, leave them alone rather than making them work even harder when they are already having difficulty just maintaining their equilibrium.