Acropora tissue looks odd right before rtn/stn events

[Scorpius]

I always give all my coral a good look over at least once a day. Anyone else notice how Acropora tissue changes right before any rtn/stn events. Sometimes the normal color/hue of the Acro is slightly off or the tissue itself gets striped. Sometimes the leading growth edges look different as well. It's hard to pinpoint at times, but I can tell that something is amiss right before stn/rtn.

Anyone else notice any other tissue changes that alerts them to impending rtn/stn of Acropora?

 

[hybridazn]

Yea a lot of times acros will look different before the impending doom. Def stinks

 

[Som1else]

Only thing i have ever noticed was less or no PE. Then again most times ive had RTN or STN its more like whoa what happened when all of a sudden you see a huge dead section that wasn't there a few hours prior.

Any pics?