my flock of 6 bantam b/b/s orps is a little over 1 month old. one of them, who is usually really energetic and stand-offish, has been sitting and sleeping all day today. i gave them some blackberries this evening, which they love, and this chick just sat in the corner of the brooder while the others fought over the berries. i've taken it out and held it, and it's not struggling at all, which is usually what it does. now that i think of it, the remaining berries in the package are now moldy. could that have hurt them? should i separate this chick from the others? aside from keeping it warm, is there anything i can do?