I had never heard of this and read the linked articles and from a microbiological viewpoint I could see a mushroom or other soft coral dying from microbes overnight, but I don't agree with it occuring in an SPS in entirety overnight (due to seperate polyps).
I used to work microbiology as a lab tech and it takes a while for bacteria to spread (yeast infection is caused by a fungus called Candida sp by the way) and you should be able to see evidence of some kind of growth.
A sure fire way to test this is to get a culture off of a coral while it is experiencing RTN (after you get a normal flora culture).
Entire colony death like that would be more consitent with environmental factors such as water quality.
Think of it as a group of people in a room, spray them all with a deadly microbe and some would die sooner than others and some might resist infection. However if I removed the oxygen from the room then they would all die at pretty much the same time.
Plenums and ultra deep sand beds > all other setups!
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