tank upgrade

hi, I am planning to upgrade my current 20 gallon reef tank that has been running for 10 months to a 74 gallon reefer 350 tank. I will be using the existing 16 lbs of live rock plus some new live rocks, and new sand bed for the new tank. Wondering do I need to cycle my new tank or I can do a...

I recently bought a Red Sea Reefer 350 to upgrade from a 46 gal Bow front. So here is my issue, I want setup my Reefer 350 in the same spot as my current 46 gal Bowfront. What is the best way to do this without losing any fish? Oh and I also bought new sand, so the old sand will go in trash...