I think that the problems are viral or bacterial, combined with tank conditions which weaken the corals immunity to attack by virus or bacteria. The viruses and bacteria may be unavoidable, or they might be introduced.
My basis for this conclusion is an experience I had a couple of years ago. I transferred RTN into a tank by bringing in a "sick" coral that I was trying to save. RTN moved outward from the spot where I put the dying frag, killing SPS around it. The closer the SPS was to the frag, the faster it died.
That's my thinking, FWIW.
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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