Just a little next day update. The tank has cleared considerably, and looks totally awesome. BC is coming by later so we'll post some photos then. The corals all look very good-- polyps opening, no sliming etc Very encouraging.
Now the bad news, my fish are in very bad shape. I've already lost a coral beauty and a yellow tang, and my blueface angel is not long for this world. The clowns are unaffected though, and I caught a glimpse of one of my hippo tangs and it surprisingly didn't look bad. All other fish are AWOL.
My ammonia tested (on a very old kit) at 0.25 and this is the likely culprit. My running theory is that by removing the entire very well established sand bed and starting with completetly sterile sand, I initiated a mini cycle that the rock couldn't completely handle. There are so many possible variables that I can't be sure, but this seems the most likely.
I knew there would be losses, though I didn't really consider the fish. I'll keep you updated. All in all I am very happy though.
Randy