As for dealing with what is left behind -
If you want to reuse the sand it will need to be thoroughly rinsed before it can be put into the new tank. Never try to "move" a sandbed.
The live rock that is sitting in the sand will need to be placed in a separate container and left for a few weeks with a circulating powerhead and 10% water changes 1X/week because it probably has absorbed some H2S in the areas that were buried. You don't want that in your new tank.
Do weekly water tests to monitor it's water quality.
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Mitch
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