I have a 4 level large cage that is wire. I have spots where they can reat their feet and also the wire is powder coated. Anyways my question is wouls I be able to use pine cat litter in the pull out tray to help minimize the smell (it would be a thin layer and its not directly in the rats face by any means) or would that cause health issues? I tried looking it up myself by I got mixed answers as always. Thanks.