that the outbreak occured 1-2 days after the temp. spike
Gary, you said it all right there. After means it took a dive and was back to normal.

Alex, you gotta solve the swing to keep these reef animals successfully. Its gotta be reasonalby stable.

There is a lot to controlling temperature. One small part of what I do for a living is monitor temperature and changes.
This all goes beyond the scope of this posting.
Perhaps a seminar series on this (Disease prevention) would be something people could benefit from?