Tank Upgrade Dillema

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I moved across town so effectively setup 2 tanks with no losses. Save the water to reuse with plans to make new to make up for the difference and should do ahead so it's up to temp.

Remove livestock and rock into tubs, break down and set up new. I added the old water to new tank, restocked and stuff wanted kept wet on the bottom, then new salt water slowly until topped up. Once water topped up do final arranging.