06-06-2011, 06:33 PM
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I agree with DKRST that it is best to not have fluctuating temperatures. For years my tanks all went up to nearly 90F during heat waves, and I never lost a fish. And I did nothing but let the tank run. I now have an air conditioner in the fish room, which keeps it around 80F which is higher than normal (77-78F) but more manageable. My fish room is on the SW corner of the house, and no shade from trees, so it gets very hot in the summer.
Oxygen shortage is a risk with higher temps (warmer water holds less oxygen, so fish have to work harder to get it, which is the opposite of what fish--like humans--should do during heat. The extra circulation, airstones, etc help with this. Leaving the tank uncovered can help by increasing evaportaqion, but make sure the fish are not those that will jump out. Many fish will jump given the opportunity.
Reduce feeding; less food means less energy being used by the fish. Missing alternate days will do no harm to mature fish.