Montipora Self Destructed!
Well I am going to go with Marc on this one.
I have had RTN hit wild colonies and have had tissue loss hit frags. The frags I could take off a piece and save it. Once RTN starts even the frags you try to save are toast. Tho I have only seen what I can say was RTN twice. I have also had SPS stressed out enough to drop all the Zooxanthellae.
I'd say there is something that has either stung the coral and is powerful enough to kill it all or there is a problem with your system. Water quality, lighting, levels etc.
Didn't you just change your skimmer? It may be that your old one was just at the edge of keeping up with the wastes in your tank and during the break in period of your Berlin the levels in your tank have gone up enough to stress the Montipora enough that is has died.
Take a look at what is around. Have you fragged any Xenia lately? have any wandering polyps?
Look to what may have caused it rather than what it exactly was that happened.
Start with water then go to other corals. SamW has raised a good point with softies and SPS. Any close by????
HTH
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