why did you boil it at all?? If it's uncured you put it in an unlit container with a heater ~80 degrees and a powerhead and let it go through a cycle, changing the water every few days until it no longer smells with 0 ammonia, 0 nitrite, and low to midrange nitrates--~40ppm. If it's cured you just put it in your tank. I don't know why you would literally boil it. The problem with that is you are killing off everything. When you cure liverock you are still saving organism (algae, copepods, amphipods, etc. etc.) that survived the harvesting, packing, and shipping process.
