Moving tanks and shutting down

Gey guys, well my fishroom is slowly taking shape and workmen are installing extracotr fans etc and building salt room. The main room needs to be replastered and i need to move the rsm into the center of the room for a few days "rsm 250" whats the quickest way of moving it as im hoping not to have to take all the water out. maybe just 100 litres ish.

The tank then needs to be positioned on another wall to make room for the rsm 500. How long do you think ill need to keep both tanks running for? id like to switch over relatively quickly whilst maintining optimal conditions

Cheers

John
 
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