Just thought I'd mention this...
"Cured rock" - sellers make this sound like it's such a wonderful thing. All it means is the rock has been in their tanks long enough that anything dead has been removed or decomposed. Now, take a piece of "cured" rock out of a tank, ship it overnight, and guess what? It isn't "cured" anymore - that's because things on it have begum to die. Put it in your tank, and there will be some decomposition.
I mention this because some places I spoke to in the past when I was building my tank made it sound like all you had to do was buy their "cured" rock and put it in your tank, and voila, you're good to go. But it's not that simple.
Now, if you could buy cured rock at an LFS, and get it in your tank in an hour, then you would probably avoid going through the curing process again.
Hope this helps.