When to add live rock?

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So I'm swapping everything in my 50g(4 years old) into a new 120g.

I bought about 50lbs of extra live rock from a local reefer who had been cooking it for a couple months. It's very clean looking.



My question is, do I need to cure my new live rock before I setup the new 120g? Or is the 75lbs of live rock from my established reef tank enough?



I figure, my 50g is stable, and if im just swapping everything in it into a new tanks that has extra water and rock in it, then my bioload shouldn't change at all and the current cured live rock should be able to handle it no problem. Then the new live rock can cure in my tank without hurting my fishes/corals right?



Thanks!