03-23-2012, 11:13 AM
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I have my fish tanks in a separate room, which in summer can get very hot, well over 90F, due to being south and west facing wit6h glass block windows on the west--which, believe me, really cause heat. I now have a portable air conditioner that keeps the room around 80F during such days, and that has worked well. The tanks obviously will not be warmer than the room.
Prior to getting the AC I did nothing. I never lost fish or plants due to the heat. The fish were a bit less active, naturally, but there was no gasping for oxygen. But my tanks are very heavily planted, which may help.
I agree that fluctuations back and forth, as from repetitive water changes with cooler water or floating ice, is probably worse than just letting things go. In the tropics, both SA and SE Asia, days can get very hot with water in the high 80's and then cooling down during the night. This is a slow change either way, preferable to more frequent variations.