We purchased live rock (from another site) which came in wet newspaper and water double bagged in a styrofoam box. We were IMMENSELY happy that we cured the rock at home in an old 20 gal with a powerhead, heater and a cheap little filter. There was a lot of debris, little shreds of newspaper, etc, as well as some genuine die-off (phew) which we scrubbed with a small wire brush. We just wouldnt want this crud in the good tank. Check out the many sites that sell live rock if you haven't already, there are many different methods of handling the rock as well as prices, etc, so you can make the most informed decision. Hope this helps!