So here I am trying fermented feed for the first time, in my mason jars. I read an article that said you should cover it, because the main bacteria growth you want is anaerobic. After 24 hours it just looks like wet sludge. So in a fit of indecisiveness and paranoia, I just have cheesecloth over day 2. This is the last of the starter crumble, then we're moving to a starter/grower feed, because the local feed store didn't have any that was just "grower". They SAY you can ferment any of these... I like the idea of a homemade grain mix, but everything is too complicated, and they write about needing to sprout some of it and ferment other parts and then mix it all precisely, and I don't even have the kitchen room for all that. Here's hoping this works.