I have a little fenced in side yard I would like to take the chicks out to play in. It's great because there is plenty of room for little ones and it's completely fenced in. I would sit and watch them there. It's getting hard letting them play in the front yard because they are too near the road and getting too quick at 3 1/2 wks old. The thing is that there is a lot of small white rocks from a previous owner where they had used the area for shrubs and put decorative rock around it and there is garden mulch all in there. I raked out as much rock as I could but there is more scattered about. Would either be harmful for the chicks?