Right now I have a75 gal some what reef tank. has hammer, stars and mushrooms in it. Im planning on getting a 120 or 150 high next month. Been researching and looking at equipment for what seems forever. Pretty much have that part done. Now on to planning a attack for the swap. The problem is the new tank has to go where the old one is. I will be adding more base rock and more sand cause of the bigger foot print. Now should I replace all the sand or just add what I need to fill the bottom? The plan right now is to use buckets for the rocks, water along with a couple brute cans. Also will have water made up to make up the difference in water volume. Is there anything I need to plan or change or expect from doing this?

