Well as always.. "it all depends" but you know that..
Are you starting from 100% scratch?
The tank has about 18 gallons of water from my established reef. The other 30 or so is freshly-made from Reef Crystals.
The live rock is (and will be, once we add more) cycled rock.
Detroit's oldest large LED tank! Est'd Jan 2005, went LED June 2009. 6' wide 130g reef, Sunbrite T10 LED tubes (3xGen 3 and 1xGen 1), mostly SPS, but chalices, other LPS, and a few softies too. http://pjr-reef.blogspot.com/