It's early to be worrying about hermit crabs. Curing of the live rock and cycling of the tank are two different things (see "The Natural Marine Aquarium-Reef Invertebrates" for more on curing).
What you want to do is boost the cultures of nitrifying bacteria so you can add fish and other specimens, yes? So, take a bit of raw shrimp/fish/squid (or similar), put it in a bit of old nylon hosiery, drop it in your tank and let it decompose. You will, at that point, begin to see the "cycle" as it's supposed to occur.
First, a rise in ammonia, then nitrites. Then, ammonia should drop, as nitrites blow your mind (All Yuor Mind Are Belong to Us!). As this occurs, nitrates should begin to creep up. As nitrates come up, ammonia should be dropping to zero levels, nitrites should drop. End result should be zero ammonia and nitrites, high(er) nitrates. If you have sufficient DEnitrifying bacteria in your (good quality) live rock, then nitrates will slowly come down, but know that these bacteria are rather slow growing.
Your pH is fine, don't fiddle with it. Your specific gravity is right where you want it for inverts. Since you're new, don't start off with sea stars at this point, the hermies and the snails will be cool. DO pay attention to what folks are telling you about which ones are more and less likely to do damage in the future. Also, know that there are folks who don't use any crabs of any sort because there is just no way of guaranteeing that any species will truly be safe. My own stance is that if you've set up the most natural setting possible (with regard to the size of the system, of course), no one creature should be able to reach such plague proportions as to wreak havoc. Another source for shells is craft shops, but do be sure to offer them their regular digs, just in a variety of sizes - many (if not most) hermits have particular preferences.
QUARANTINE EVERYTHING!!! (Yes, including inverts)
You'll need to learn to tell the difference between the two if you opt to use these.
