I would actually have to disagree with this, based on my experience using both methods. My 40 gallon was set up and cycled using both live sand and cured live rock from the LFS. It took 6 weeks to cycle. When I set up my 200 gallon, I used dry base rock with dry base sand. I added 1 cup of sand from my 40 gallon, and the tank was done cycling in 4 1/2 weeks.