Further to my post, I didn't notice any problems with any corals, nems or fish while this was happening. Also, no abnormal skimmer activity, and the parameters were all good. Thsi all started to happen shortly after I added my blue squammy... which is now my only remaining survivor.
Here's a post I started on the same topic... check it out if you like. Much of the same info in there, but maybe some new stuff?
http://www.canreef.com/vbulletin/showthread.php?t=70898