When I transferred my 100 gal to my 150 gallon, I added new sand right a way, then 2/3 pieces of my old rock and then waited for the tank to cycle. I then slowly added the rest of the rock a little at a time; then I added the hardiest corals; then the next hardiest, etc. I didn't have any fish because I had to stuff everything into a 65 gallon ex fresh water tank. I even had to put some of the rock into a rubbermade container with a light propped over top to keep it 'alive'. That's the rock that went first into the new tank.
AquaAddict
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