When I swapped my 180's, I shoveled (literally with a dust pan) all my sand into pails, did a quick rinse with tank water, then dumped it into the new 180G.
I saved all the old water I could, and put what wasn't in drums holding my rock back into the tank and ran a diatom filter on it for 2 days, stirring it a couple times a day, and changing the bed in the diatom at times every couple of hours when it plugged.
I have not seen any issues in my tank since everything was put back in.
HTH
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Getten Outta Dodge
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