OK, here is my plan of action.
I am picking up a 55 gal
and setting it up as a SW
tank to put most of the LR
and the fish in, along with the live sand out of the sump.
Then I will get a big can to put the rest of the rock and sand into, along with as much water as I can salvage.
Replace the tank, reload with sand water and the live rock out of the can.
Start the cycling process all over again since I am disturbing the sand bed (been there for years).
I will be leaving the fish corals and remaining live rock in the 55 gal
until the main tank is stable again.
Did I leave anything out?