Aji Dulce = Shavings & paper towels on top of shaving for the first week. I use a plastic bin, don't use anything under the shavings but then my chicks are in the plastic bin for the initial week then go to the outside brooder in the patio ... I use t MHP (heating pad) for warmth and they do well. Check out the thread MHP by Blooie in Raising Chicks.