Dan it is time to intervene we know how to save tanks like this. You'll have to do the #1 thing you dont want to do, to save the tank, n (re clean it all with new water) waiting will not work it will be a slow loss cascade.
Removing your sandbed didnt cause this
leaving clouding did, we didnt catch your move preps in time to run them through the sand rinse thead, then you would have set up cloudless, and lost nothing.
read these examples for how to fix your tank in time before total loss. this is the price of big tanking, having to redo the cleaning aspect in order to save it.
100 sandbeds fully removed without one loss
https://www.reef2reef.com/threads/the-official-sand-rinse-thread-aka-one-against-many.230281/
what they have in common is cloudless setup using all new water
here is the most recent example of a big tank rework using cloudless reassemble
https://www.reef2reef.com/threads/120-gallon-rip-clean.679588/
both of those threads use the principle of cloudless rebuild to get what they get as after pics, when you mentioned clouding a couple weeks ago I sensed an issue coming up. the tank is going through something called eutrophic shift; what we do is the single best way to cause oligotrophy which is the clean uninvaded vibrant reef condition.
take no shortcuts, wait no longer, those two threads have fix after fix documented.