As the morning progresses, the button polyps are opening, so are the brown and green star polyps. Mushrooms are doing better. Fish are out and swimming around quite well, but their feeding response is a little slow, mostly I think because they are missing the heavy feeders that perished. Looks like the bad stuff in the tank has passed, though
It'll probably take me a few days to get over the shock of the whole episode
One point of interest is that both dead fish were found with all their fins wide open as if they were in full display. Other fish that have died for various reasons all had their fins clamped closed.