I am having a serious problem with flies being attracted to the fermented feed. I walked out yesterday and the entire top of the feed was black with flies. I removed the feed, washed out the bowl and put up fly traps. Since removing the food, the flies left for the most part, but I just fed the girls some more fermented feed and within minutes the coop was over taken with flies again. What does everyone do to help with this? I have since just switched them back to dry food until I can get the flies and food under control.