I just did this move last weekend. I invested, or i should say, overly invested in Rubbermaid. I moved from a 55 to 75. I dumped my live rock into 2 18 gallon containers( i bought 5, u can never have enough storage) cuz putting it all in one you'll discover is way too heavy. Dumped the sand in another and the fish in another. I poured the sand slowly into the new tank, preventing as much as possible the clouding of the water, then aquascaped it with a design i'm quite proud of(pics coming soon). Used one of the empty Rubbermaids as my new 18 gallon sump, got the new mag 7 pump and filter and skimmer running, then slowly added the fish. Then i plopped my butt on the couch cuz it was alot of work. A couple hours later i checked and discovered my fish really love their new home and all the new space. However, i did lose my 2 skunk cleaner shrimps( bert and ernie). Maybe the move did it or maybe i didn't acclimate them slowly enough into the new tank. Whatever the cause, it was my fault anyway cuz i'm the one who disrupted their world. 4 days later and all my fish are happy and alive.
yellow tang, coral beauty, pair of perculas, fairy wrasse, diamond gody, banded goby, neon gody, striped cardinal, skunk cleaner shrimp, red serpent star, 2 peppermint shrimp, a couple dozen blue legs, and snails.