I have a 4" PVC feeder with a clean out elbow at the bottom. The girls have done very well with this feeder up till this week. All of a sudden they are throwing feed all over the coop rather than eating it!! I filled it one day and it is empty the next. I have been limiting the amount of food I put in it and am feeding them daily. I feed Layena pellets. The coop is 8x6 with 6 hens and Amos the Roo. Any Ideas why they would do this?? Any suggestions for a different feeder?? I need some experienced advice. Thanks