I have a watermelon/produce box for my chicks (they come next wed). I have lined the bottom with cardboard (so I can replace that instead of the whole box if it gets wet/soiled). I was wondering if I can line the bottom with plastic as well (drop cloth type). I worry about them slipping if the bedding has been moved. Also I have seen people line the brooders with paper towel over the bedding for the first couple days. Is there a reason? I have pine pelleted bedding that I'm going to fluff up first. Thank you in advanced!