Mine were on shavings but I had paper towels over the shavings the first week to keep them from eating it. I've heard to use the larger size shavings - it's usually available in two sizes - so they won't confuse it with food.
Were they on medicated chick starter? Chicks can still get Cocci even if on medicated chick starter so that's not fool-proof but sometimes helps. You might want to consider adding unpasteurized Apple Cider Vinegar with the "mother" to their water as it's reported to help make them resistant to an overgrowth of cocci. I use Heinz that I buy at Walmart - 1 tablespoon to a gallon of water.
Good luck and I hope that things turn around for you and your chicks!
Were they on medicated chick starter? Chicks can still get Cocci even if on medicated chick starter so that's not fool-proof but sometimes helps. You might want to consider adding unpasteurized Apple Cider Vinegar with the "mother" to their water as it's reported to help make them resistant to an overgrowth of cocci. I use Heinz that I buy at Walmart - 1 tablespoon to a gallon of water.
Good luck and I hope that things turn around for you and your chicks!