OgreMkV-
When I started my 90g back in November, I had the whole thing cycled in a little over 2 weeks. Here is what I did:
1. I used 100% dead rock and dead sand at first. I even filled the tank with tap water - I just ran the garden hose in the house and turned it on. I mixed the salt in the sump and added de-chlorinator to the water.
2. Once my salinity was stable, I added a couple of pieces of LR from my 55G. I made sure some was touching the sand bed and some was touching the other rock.
3. My tank started cycling immediately. For the first week, all I had was Ammonia readings, nothing else. About half way into the next week, I still saw no nitrite readings and no drop in ammonia.
4. At this point I started getting impatient and added a product called "stability" from SeaChem. I had used it in my 55G when I moved it to prevent a cycle and it worked great.
5. A week after starting stability (see the graph below), my ammonia and nitrites were gone and my nitrates had moved up to 20, which is perfectly acceptance for fish and most soft corals.
I never added anything dead to my tank, or any fish till the cycle was over -i.e. my nitrates were around 20 and the ammonia and nitrites were gone..
Even tho the rock you bought was alive, you'll still get some die off, which is a good thing as it will feed your cycle. Plus you'll have some things dying off from your dead rock now that it is submerged again.
I can't imagine waiting for 2 months for a tank to cycle...that'd kill me! It was hard enough to wait the two weeks that I had to till I added the livestock from my 55g.
One last thing to consider is that if you haven't added a protein skimmer yet, go ahead and do it as it will have plenty to munch on as your tank cycles.
Graphs: The first one is just ammonia and Nitrite, the second is Nitrate. You can see that on day 4, the ammonia and nitrites started dropping and the nitrates started rising - exactly how a cycle happens naturally.