My youngest chicks are 3 weeks. I was using TSC large wood chips they recommended for reasons I do t even know. When those were out I got something different from the feed store. I didn't get to pick the type, they just hauled out a bag when I asked. I was skeptical because they were small and dusty. I tried it and it turns out the chicks LOVE it! As soon as I put it in they began trying to take dust baths and peeping excitedly, scratching all over, then nestling down in them for a nap. They never behaved that way in the big ones. They wouldn't nest into the big ones, I don't think they liked how it felt. These seem to stay drier too, to at least the wet stuff doesn't readily seep to the dry parts. Can it be that terrible if they love it so much?