Has anyone ever had a problem with crop fungus in young birds, from the use of brewers yeast. I have read an over whelming amount of positive remarks about using B.Y. but I also read that young birds can be a problem. I currently give my flock organic Apple cider vinegar twice a week and just started a B.Y. and garlic powder global's mix once a week. Every 2 weeks they receive wheat germ oil and probiotics. Since I'm using the ACV do you think this will reduce any fungus problems?