I just realized I turned my AC off before I left for vacation during a heat wave and my room happens to be the hottest in the house. Sadly not the first time I forget about this important thing and probably not the last time I’ll do it. The good news? Nothing died and everything seems to be fine as far as I can tell from the pictures and videos that were sent to me and the AC is back on. I also temporarily turned off the heater to see if I can drop my temp to where I keep it. Fish and corals are so resilient in my experience. So what the hottest or the coldest your reef tank has ever gotten and survived?