STOP - The whole idea of LR is to get the cool life forms that come with it. If you just want base rock for your aquarium go to Miami - wlak the beach and pick up pieces of coral; drill some whole in it, break it to pieces that will help build your environment, wash the hell out of it, boil it and put it in the tank. Your existing LR will seed it over a few months and it will have been rock - YOU made.
Another approach is to get quickcrete and play sand and a box. Place the play sand in the box and make 6-12" craters. Add teh quickcrete and when it's dry - drill some whole in it and boil it and use this for BASE - A Whole Lot Cheaper - Plus you can make the pieces anyway you want. You can even throw some coral pieces onto it for effect.