So, I start my chicks on several layers of paper towels, covering newspaper, in the brooder. I've been told to be cautious about how soon I switch to shavings, as the chicks might get confused and eat shavings rather than food. My chicks were a week old this past Wednesday, and I've had them, on daily changed paper towels a week tomorrow. Changing those paper towels everyday is getting old. When can I safely switch them to shavings??