How to upgrade a tank?

[sphelps]

My procedure would be along these lines:

• Temporarily remove the water from the 100gallon
• Carefully lift and move the 100 gallon far enough out of the way for the new tank
• Replace the water in the 100 gallon and keep system running in new location
• Begin setup of new tank, avoid any uncured rock, add new sand, add new water
• Let the new tank settle for about 24 hours
• Plumb new tank into 100 gallon viva common sump, run for a few days.
• Transfer over livestock
• Disconnect 100 gallon
• dismantle 100 gallon and apologize to your other.

The last step is key!