From about mid June to September my temps go from 77 at night to 81 (or 82 on a really hot day). And this is with central AC. Without central AC the temp will go beyond 83 which is too high for my comfort level :-) At any rate, my tank seems to do fine at 81/82. As already suggested, do make sure your tank is well oxygenated (which most tanks are anyway, with skimmers, etc) if your tank is trending to the 80s.
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