I just made an upgrade from the 29g Biocube to the 40g Nuvo 2 weeks ago after about a month of planning. You can do as much planning as you want but it's still a slow process. I just 1 20g brute trash can and 5g buckets. 1 bucket had only water and LR, 1 bucket for fish, and then I separated corals out so they wouldn't sting each other in different small contain. I daisy chain an air pump going for the containers with fish and coral in them. You shouldn't have a problem using your old sand plus new sand since your old sand is only a small footprint compared to all the new sand u will need. From 14g to 40g will obviously be mostly new sand so be prepared for a diatoms algae bloom within a week. I did not get my fish and coral in the new tank until the next evening because I didn't want there to be cloudy water when I re introduced everything. They tank is awesome, you'll love it! You will absolutely need an ATO though unless you don't mind added RODI water pretty much everyday, it's veryyy sensitive before micro bubbles start coming out of the return. Best of Luck!