I don’t believer you have many other choices .So is the consensus here saying remove all fish and put them in a quarantine tank?
I do believe the stress of this will kill them all
either they stay in the tank where it’s not going well as it is .
if you choose to qt with some of the rocks which are live it should skip any cycle or ammonia spikes . ( ammonia should still be tested and monitored )
once the display tank sand is cleaned the fish can go back .
I can’t tag jay
@ReefSquad could also provide advice
@vetteguy53081