What you've described sounds like Aspergillus Mold. It generally appears as a thick white layer, like marshmallow fluff. (It can also be black or grey too).
Very possibly, but I've just researched that a bit, and that mold family is described as being white and some other color. My stuff is just white.
I am trying to grow this in both my kitchen and a bathroom. Both rooms are spacious and well ventilated. What is most important, IMO, is I know there have been mold problems in this house before ... I've done a lot to address that, but I know there is still mold here and there always will be. There are also pets, people, and houseplants. One thing we don't have a lot of is carpeting (mostly some tile and bit of hardwood throughout this home). Of course I thoroughly and constantly clean the areas where I'm working with the fodder. I'm not afraid to use bleach in my house ...
I can't imagine there is any area here, inside or out, barn or other building, where there ISN'T mold. No, I won't be buying a stand-alone fodder system ... and even with those I've read about livestock deaths from contaminated fodder, so ...
Quite possibly growing good fodder isn't possible here.

I hope I have better luck with fermenting feed. And once I can get my pastures set up appropriately the fodder won't be necessary.
It's a shame, really. It would have been such an awesome thing to do with all the rye I've got! Maybe I can mix my own feed?
Ugh. What I won't do for my chickens.
