Yea... it crashed. After my last post, the cloudiness was followed by a long, steady die off of coral and anemones. After 2 poly pads and about 400 gallons of water changes, it wasn't abating, so I decided to separate my sump and use it as a quarantine for the surviving coral. Well, apparently the oxygen content was already low, so without the skimmer or the overflow to the sump adding bubbles, the level dropped and all my fish died overnight.
Long story short, my tank is dead except for some soft corals. The survivors in the sump are a blue hippo, my magnifica and 2 clowns, and maybe 3 hard corals. Bad times to be sure...