The 400 has all kinds of "new tank" issues, so I wasn't completely surprised that something went wrong...I immediately suspected any number of the things you've mentioned, but the 30 has been running flawlessly for years. There was no change in procedures, or any event beyond the introduction of the bit of coral.
I should have dipped that coral bit before I put it into the 30.....there's the lesson learned right there.
Since I was able to transfer the problem to a completely different and isolated tank, the cause must have been biological/microbial/viral...not environmental.
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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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