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"You can just transfer everything over at once. You will obviously have to make sure that the new salt water matches temp/salinity of the existing tank water. \n  \nWhen my upgrade comes in I am putting the new tank in the exact same spot as the old tank. I plan to siphon the water into buckets with the livestock, and use all new water to fill the new tank (that has all matching parameters). No need to use old water since it doesn't carry any beneficial bacteria.  \n  \nYou can even use all new sand if you want (if your tank even has sand).  "
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