I purchased a 150 lbs of rock from marcorocks when I set up my tank. It was a great deal and saved alot of money.
I have a 90 gallon and used most of the rock for aquascaping I also went to the LFS and picked up 25lbs of LR since I was cycling my tank I didnt need to cure the rock from marcos in any tubs or anything just set it up and cured it while cycling.
The rock arrived in great condition huge pieces no joke huge.
after months it was well colonized from the LR. 6 months almost fully covered in coraline algea.
Heres a couple of pics of the tank.
(THIS ROCK SHOULD BE CURED BEFORE ENTERING AN ESTABLISHED TANK LIKE MOST DEAD DRY ROCK) 
Shot with
E3100 at 2007-07-27
Shot with
E3100 at 2007-07-27
Shot with
E3100 at 2007-07-27