Death of a single coral/colony will sometimes spread to nearby corals. This has led me to conclude that there may be a bacterial component at work.
I'll provide an example...
I was running two isolated systems. Both had healthy populations of SPS. A colony began to die in tank A. So, thinking that tank A had some kind of problem (lighting, CA, Alk etc.)... I moved the colony into tank B.
When I returned to tank B less that 24 hours later, 4 SPS closest to the imported colony had died.
There was nothing wrong with any SPS in tank B. The addition of a single piece of dying coral killed others within 24 hours and it killed corals closest, first.
It has nothing to do with tank parameters.
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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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