Stack, I am in that very position again.lol Thinking about it is more daunting then it actually is. The biggest issue is the darn sand beds.
This is what I have done, and will once again be doing soon possibly this week.
Having a few extra smaller tanks, and or heavy duty plastic bins for the inhabitants & live rock.
As well as a few power heads, heaters.
Extra surge protectors in case there aren't enough outlets, which there won't be.
PLan on saving as much of the existing tank water.
Will also be picking up more Brute Food Grade cans, making about 120 gallons of ro/di water just incase there is a need for it.
Move all the animals starting with the corals into individual tanks/bins with water from the main tank.
Remove the sand bed last. I will be tossing the sand bed, so I have to go through it carefully to find all my crabs.
Remove, and replace stand with the new one. Make sure it is level!!!!
Replace the tank, replace the sand bed with new sand.
Begin returning rocks & water from bins & tanks. Following with returning corals, inverts, fish & more water. Then top off with new pre-made, pre-salted water which should also be a correct parameters.
Not as hard as you think.;-)
BTW, have lots of towels on hand, also plan for a whole day of work!!

Would be nice if you can get some help to.
