I feed FF in the morning and regular feed is available all day. All of my chickens LOVE the FF, but they've been eating it since they were babies. All four batches of chicks I've had over the past year refused to eat the FF for the first week it was offered (3 batches of day olds, 1 batch were about 6 weeks when I got them). And then something clicks and they can't seem to get enough of it. Sometimes they lick the bowl clean. I don't know why or how - but that's been my experience. They don't like it at first but I keep offering it and then after a week or so, they are super excited to get it every morning, even though they have dry available right beside it. I offer FF to provide additional probiotics than what is in the feed, get them to eat more fines, and I don't use ACV in the water. Does it make any difference to my chickens health? I don't know for certain but it makes them happy and it can't hurt. So far I have been fortunate not to have birds with sour crops or vent gleet - maybe its good genetics, maybe luck, or maybe it's the FF.