there is a site that says to "dip" your rock in a high salt bucket for one minute and all of the living stuff comes out of the rock an into the bucket, then you just pick up what you would like to put back in the tank and destroy what you don't. You can definately cycle with cured LR. It's faster, just more expensive (normally). The beneficial bacteria are already growing, they just adapt to the new tank and you are ready to go.