How long do you think it takes for Lace rock to become live enough to aid in filtration?
It should already be at that point. You wont really see any outward signs that the live rock has an ample population of bactera on it to aid in the removal of ammonia and nitrite.
Over time and you should slowly start to see it now you will see our lace rock have spots of corline growth on it. Over time the lace rock wll be covered in this purple, red, orange encrusting algae. Worms and pods
will start to call the lace rock home helping to remove traped waste and food from the crevices of the rock surface.