ok, ive been trying to do as much research as I can to make this transition as stress free for my little aqua-world as possible, but i'd like to see some others opinions. Here goes:

current have 55gal + sump with skimmer in it
upgrading to a 75gal + larger sump + fuge

Im going to need more sand and rock to fill the tank a bit more and this is where I run into issues. I bought 25lbs of cured base rock (not arrived yet) but havent bought sand yet.

I was thinking of buying like 20 lbs of live sand, 20lbs of "dead" sand and putting all that in the new tank, along with the base rock and a piece or 2 of live rock from my tank (approx 5 yr old tank). Then, a week or so later, drain half the water and add the rest of my stock into the new tank.

Since my tank has been up and running for so long, how much of a cycle will it go through if I just added it all into the new tank? additions would be approx 35gal of water, 35lbs of sand(mixed live and not) and 25lbs of base rock