I Transferred my tank about 2 months ago and didn't have any problems. I started by Removing as much as my coral LR and fish and putting them into Big tubs. The key is to always make sure your tempatures stay consistant whil doing the transfer. Next i added all the new RO water i needed to my new tank and put all of my old water into the new tank from my old tank. After then i started acclimating my coral fish and LR. It was pretty easy and my tank was about 20 feet like yours. I used all new sand to minamize my chances of getting a cycle.
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