Wellp, here are the events:
Crack new bucket. Mixed salt. Waited four hours. Did water change. Stuff got dead. Water tested normal for all testable parameters
Fish are happy. Corals look like they've had an abrasive pad applied to them liberally. It's really odd, not your regular RTN event. A lot of them kept polyps, but lost all surrounding tissue. All mollusk and echinoderms were pretty much dead withing a couple hours.
Maybe a better title for this thread would have been "I did a normal water change and wiped out my tank. I am speculating that the salt was the culprit - Or evil voodoo magic. 50/50"