Hey guys, so I have 12 bantam chicks im raising who are 5 weeks old now. They are in their brooder and I put pine shavings down, 4 inches deep and they dig into the pine shavings, scratching them and kicking it away to look whats under. And the smell is really bad, I was told i can replace it once a week and theyll be fine, but its the third day and the smell is horrible. What can I do? I would really appreciate any advice. Thank you so much.