You'll still get some nutrients added to new saltwater when the cured LR goes into the tank. I would only use RO water for any new tank. Also, new saltwater does not have to be "cycled" before the cured LR goes into it. The cured LR will cycle the tank pretty quickly.
One more thing, there is no need to fill the display tank with new saltwater until a day or two before putting in the cured LR. Cured LR can stay in the curing container for a week or two while you're filling your tank. There is no need to hurry along the process.
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