Whew I am glad I asked this question here as I would have had a major disaster if I hadnt. I picked the rock up from outside when setting up the new tank and gave it a quick sniff and no smell so I honestly figured it was ok to put into the tank. It has been sitting in a tub of saltwater for 3 days now and holy crap that stuff had alot of die off still even after baking in the sun for a week! The water turned nasty brown cloudy in the first 24hrs and started to smell pretty bad. Thanks again for everyone that posted and told me to cure it for a couple of weeks!