89F for a day -- the heater stuck in the 'on' position and took the temperature up five degrees in a short span of time. Two corals bleached, everything else was just fine. The bleached corals are coming back nicely, no permanent damage.
Right now it's HOT here and there's not much I can do other than crank up the ceiling fans and a/c; because we live in an apartment and get heat from all the floors below us, even that only takes our apt temperature down to 82F or so. All the tanks are at 86-7F, but everything's fine so far.