this kind of depends on your deffinition of LR. when i think LR i think coralline algae and good bacteria. if you put rock that is notlive in with rock that is live the coralline algae will spread as will the beneficial bacteria. if you put in only rock that is not live it will eventually become "live" in the sense that it has the good bacteria on it, but it wont have the coralline algae and other things that can come on your LR.