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.
125gal. megaflow. Fish Residents:
Yellow Tang -(Junior), Flame Angel -(Flamey)
Bicolor Blenny -(Butch), Randall Jawfish -(Jaws)
Lawnmower Blenny -(Lenny), Talbot's Damsel -(Dottie), Tomato Clown -(Ketchup)
Nameless fish include, Neon Blenny, Singapore Shrimp Goby, Yellow Tail Damsel, 1 Skunk Cleaner Shrimps, purple pseudochromis.