I have used the ammonium chloride method for cycling tanks for 32 years with great success. Using a piece of shrimp or fish instead should also work fine, although perhaps a little slower, but old habits die hard. Somehow, I like to be in control of what goes into my tank, especially at the start, but that is just me. BTW, hwttdz1, don't be concerned about the "quality" of the live rock and sand as far as cycling goes - it doesn't matter, although the quality might matter later in terms of appearance, diversity of hitchhikers, etc. A handful of sand from an established tank is all you need to seed bacteria for the cycle.