When I went from 75 to 100 gal I just bought a couple big tupperware storage containers from Wal Mart and seperated everything by livestock and rock. Keep a heater because the temp drops fast. Start with a couple gallons of make up water in each, then use as much of your tank water as possible and distribute it through the containers and the new tank. If you have one of those little pumps that sucks water off the floor it comes in handy to drain your water. Or you can just use a tank pump with a hose attached. It's easier in the tupperware containers because you can spread everything out. Makes it easier to aquascape. I've moved mine that way 3 times. No problems except the starfish clinging to a rock them almost de-legging him when I positioned the rock. >_<