Thank you all for your input. Calibrated refractometer showed 1.025...
A quick update: did 2 20% water changes using reef crystals (on consecutive days), and changed the light bulbs just in case. No visible new tissue recession in non-trumpet corals. In fact, many of them opened more in the past 2 days than I've ever seen them before.
Candy canes seem to open quite a bit although tissue recession is still visible (not in all canes, but I have over 100 heads...). It definitely does not look like the trumpets with severe tissue necrosis will recover, but I am not sure if new trumpets are losing their tissue. I will probably do a 10% water change in a day or two...
Anything else that could possibly cause a quick tissue necrosis in a stable system? I don't think that I solved the mystery of what caused the quick tissue necrosis in the canes, but I think that the new salt might help it a little
Amonia, nitrite and nitrate are still at 0. pH=8.4, alkalinity=9 and calcium is at 400
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