Adding new live rock to existing tank

[Kgrizzle]

I have a 30 gallon reef tank and have just purchased a 72 gallon system that was running for 5 years.

I want to take everything in my 30 gallon and transfer it into the 72. Live rock, coral and fish to move. The 72 has no fish or coral in it currently as I sold the fish that came with the purchase.

What would be the best method of doing this?

... I thought that if I add the corals to the 72 with the fish slowly not much would happen as it would be like purchasing new pieces ... But when I add the rock from the 30 gallon there would be some sorta nitrate spike or something