I forgot to ask how you store the feed. Any chance it can get damp and develop a touch of mold? The only other thing I really recommend is getting a bag of good feed somewhere else and insisting that they eat it. It could have started with a bad bag and then they might have gotten a mind set that pellets are bad and corn is good so only trust the corn. If you can get a bag your sure is fine and they still won't eat then perhaps mix in some greens and or worms into a daily amount of feed for awhile and see if that works. Also change the spot you feed them even if by a couple of feet, and really scrub the container so its clean, well rinsed and dry and so everything is a bit different then when "feed is not good" idea got into their heads. Maybe get them thinking feed is good enough that way instead of feeding them corn.
