Hello... I've read people recommending and not recommending certain litters. My question is, what exactly is it in certain litters that is harmful to ferrets? I recently purchased "Fresh Step" and have used it just two days and am very happy with it. Even though it been a short time I haven't noticed "Darlene" acting strangely or sick. I have only owned her for two weeks (my first ferret) and would appreciate any opinions or information. Thaks ike [Posted in FML issue 0885]