Did you miss the bloom that killed fish?
I saw the video of the bacteria bloom that killed some fish. IMO i missed the video of a system crash....
I guess to me that was just him dealing with an ugly phase in an immature tank; he overdosed some bacteria leading to an infection in some fish. He didn't lose a substantial amount of fish or coral (did he even have any coral at that point?).
A "crash" to me is far more than that...But tomato/tomahto...