My tank hit 86F when I woke up yesterday morning, with no ill effects to anything. The fish were all swimming around, the corals were out and there was no sign of any danger. I needed to top off, but that was the extent of it. I added 5g of 75F water to it and everything seemed to have been fine. This morning (after cranking the AC of course) it's now staying at 80 all day. Whew!
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