How long should a non-slip cover be placed over the floor over shavings/straw/ect. before it's safe for the chicks to walk on? For instance, I'm getting baby chicks, standard 3-day old's, and I keep reading that paper towels or terry cloth towel be placed over substrate for a few days, does this apply to newborn chicks or to all? Does the cover stay on for the first week of life? Two? Sorry, I'm confused. I need an exact timeline for when it can be removed. TIA!