75 ---> 180

Ok, so first time doing this. Thought I would get some advice.

I am about done with my stand I am building for my new 150 gallon tank and am about to get it up and going. (Will be posting pics soon) Onto the question I have for everyone.

I have my 65 gallon with a 10 gallon sump. So roughly 75 gallons. Stocked and running.

Switching to this 150 with a 30 gallon sump. Roughly 180 gallons.

Here is my plan, tell me if its going to work and what I should maybe do different.

Going to buy all new sand and put 100-120 gallons fresh RO water with salt mixed into the 150. Let the sand settle for however long it takes. Then move the fish into holding buckets. Transfer the remaining water, and live rock from the 65 over to the 150. Then drip acclimate the fish to the new tank. After the sand settled was planning on doing the rest in an afternoon.

Big question I have to this is when I move the live rock over and plop into my new tank will all my beneficial bacteria stay alive? Do I need to cycle the new tank for any reason? Or can I realistically do this in just an afternoon?

Any help is appreciated. Feedback is welcomed. Thanks in advance.

I just did the same but I done it with a 90gal.  I added new sand and some LBTR to the 90 then after I got the water to match up I moved everything over from my 29gal.  That was just a week ago and I did have a small cycly that lasted less than a day and everything faired well so far.  I also done a drip acclimation because I didnt want to chance loosing anything.  I also seeded my sand with a couple of cups of the live sand out of my old tank.