Big upgrade, big issue

[tank freak]

Hi everybody
I have for the moment a 70g tank which is standing on a glass stand with the sump underneath it. Yesterday I saw that the stand has a huge crack in it on one of the main supports. No good. Anyhow I've been thinking for awhile now that I should upgrade or have another tank which in my case would be a 370g tank 80*40*30in. My plan from the start was to one day start the setup, let the cycle do its thing and then slowly start adding everything else. But with my 70g issue that can't be the way, I will have to empty my current tank asap as I have around 20 corals plus 8 fish, shrimp ,cuc etc and it's on the first floor. My calculations tells me that if I empty my whole tank in the new one I will have about 5in of water, great. my question is how much water can I add per day without completely destroying the bio balance, or does anyone have any other ideas?
Tank you in advance

 

[spanko]

IMO as long as the water is matched for the most part to the water already there you should not have a problem adding the rest of the water all in one or two days.
Temp salinity ph being the most improtant matches. If you use the same salt as you have been using all along everything else should be fine.

 

[ajar]

Just make sure you move your LR at the same time, and any new LR you get is "fully cycled".

 

[tank freak]

Great, thanks
I will move my whole aquarium at once in one move half an hour max and then add a few cured rocks weekly.