I have 24 chicks between the ages of 4-7 weeks. I was using the typical farm store-bought waterer. They were drinking around 2 quarts every day. I didn't notice much spillage to be honest. 2 days ago I switched to the horizontal nipples. Although I see them playing with the nipples, hardly any water has been drank (by checking the tank). I see them struggling with the nipples, moving them side to side, but I don't see them pushing it. I also don't see them doing this after they struggle with the nipples... Should I be concerned?