I upgraded from a 90g to my current 150g in the same fashion and everyone made it over just fine. All inverts, corals and fish without skipping a beat.
Preliminary steps:
a. calculate aproximately how much new salt water you will need to top up the new tank after everything from the old tank has been dumped into the new tank.
b. make up some new salt water in rubbermaid tubs or trash bins before hand. Heat this new water to the same temp as your current tank. Also Aerate.
Now..
1. start to pump water from old tank to new tank
2. once new tank has enough water for rocks, start placing rocks from old tank to new tank.
3. Continue 1-2 until everything from old tank is in new tank. If need be, live rock and be out of the water for a while so long as it is kept damp.
4. Once all the rock is out of the old tank then start fishing out the fish and place them in the new tank.
4. At this point the entire contents of the old tank should be in the new tank and other than some dirty water they should be okay (just a little freaked out is all). Also the new tank is only about half full because it is a larger tank..
5. Start to pump New Salt water from its holding area to top of the new tank and mix well with powerheads.
key notes:
* You will want to have a heater and possibly a powerhead in each tank (old and new) while you are in transition.
* also, i recommend using mostly new sand but seeded with some of your old sand. The old sand is probably all old and nasty.
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