wow. good luck dude. I'm afraid of sandbeds becuase of situations like this. They're horrible experiences to go through and not having sand in the first place gives me the piece of mind that I won't do something as drastic as this.
If your alkalinity and salinity between the 100% water and the old water are the same you shouldn't have too much for losses. I've done 100% water changes myself. They're nerve wracking but I've never had problems beyond molusks dieing.
GL
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Everything I put in my tank is fully dependant on me.
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