Very enlightening; another great article.
I had a bad thing happen to my acros recently. My wife told me, "something's wrong with the corals." She observes the tanks a lot more than I do, and I should have listened. I've been working two jobs at the same time. I'm not trying to make excuses; I could kick myself. Some of the corals I've had for years.
Well, after taking the time to find the root cause of the problem, I found out that the temp was 84 degrees. After using 4 different thermometers because I couldn't believe it. All the other corals seems to be making a recovery, but the acros aren't going to make it. Controller went bad - it was reading 78!