Ok, I'm going to hijack this thread for a bit although it still pertains to FF...
I LOVE FF as do my girls however I'm limited to 4 - 6 chickens & I live in a residential area so no crowing. Since I learned about fermenting been doing it but recently have had a small issue. Feed here comes only in 50# bags, yester - years I could get 25# but that was a long time ago
Anyway being that I only have 4 BOs, it's been warm & humid, I can never finish that bag fast enough. Prior to these I had 5 Blue Wynadottes from Oct - April and had the same thing happen....
Feed mites when I get down to about 20# left (30# in 2 months). Past 2 bags of Flock Raiser I didn't finish & dumped. Both times I washed down the bin & dried it well, sprinkled DE. I've never had this problem since I started raising chickens (2013) & picking up my feed from the same feed store.
Questions - Are the mites in the feed, with the weather "hatching"? Or is it the storage at the feed store? Would changing to a grain feed have less chance for mites? Should I start buying 10# bags?
The feed store I go to don't sell FR in smaller bags, they do sell Dumor which I don't like the results. Another feed store does sell (Nutrena) feed in 10# bags, end up costing a bit more but no more mites? I hate tossing the feed although I take it to the landfill where there's alot of feral chickens so it's not really going to waste.

All your opinion & advice would be greatly appreciated. Thank you