Major Crash!!

Well I would say start doing water changes on the tank. Make sure the ro unit ok as the goes with getting new batch salt. Remove all the sand and have it washed and placed back inside the tank. I would remove the rock and use new live rock. Kill the rock you have and after wash it, than you can put back later after a month or so can reseed it. A skimmer can help alot too. Calibrate the refrectometer again.
 
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