I got both Tonga shelf and Fiji rock from Marcorocks which comes completely dry, so you get a lot more rock per pound and at a very good price. Since it was at one time live rock, it now has a lot of dead organic stuff that will need to decay during the curing process. Marc reccommends just adding some live sand and live rock, heavy skimming, good water flow and frequent changes to cure and seed it. He also reccommends adding one of the bacteria preparations to help it along. I have read many ways to cure this rock and one of them that seems to speed the process is to soak it for some time in a 50/50 vinegar mix, then throw it in a container of saltwater with a heater and powerhead, doing a couple of 50% to 100% water changes for a few days, and then after a couple of weeks add some pieces of live rock to seed it.