You are correct...LABs have to have a source of oxygen to survive. They derive it from the organic material they are feeding upon and no amount of putting plastic or tight lids over the buckets will keep this from happening...nor should anyone be trying to keep it from happening.
Here's a little blurb on it from Wiki....I'll highlight some important points in red....
I doubt just putting plastic or plastic and then a lid will make an FF bucket an efficient anaerobic digester....if it were that easy the wine and liquor industry are spending WAY too much money on trying to keep out wild yeasts. We'll call them up and tell them to just use a plastic bag...
I suggest folks do some serious reading on the difference between these two, read more about wild yeasts, about the process of fermentation of feed grains and all the end products....without just reading someone's misinformation on a blog site. Dig deeper, read more reputable information so you won't have to get it second hand and wrongly so.
Yes, I know Wiki isn't always accurate about things either, so read further, dig a little....I just posted this so folks can get an idea of what is going on in their buckets....and it's not the aerobic kind of digestion going on, with or without your lids screwed down tight or plastic over the buckets.
I suggest, while you are digging and reading, to just leave the bucket lid cracked open on one side, stir your feed before feeding out and scrape down the bucket sides while doing so and just enjoy the simplicity of the system....it's healthy, it's working and will continue to work, just as it has for many people for the past few years using the same open air system to produce fermented feed for the chickens.
No starters needed, no lids or containment to limit oxygen to the feed is needed, no water over the level of the feed needs to be maintained, and no over thinking of a simple process is needed.....learn about it, own the information and don't repeat what is learned on blog sites as certain fact unless you've done the research to confirm it as fact. I used to have several links about such information and they are probably buried deep in these two threads but I'm too tired to go looking for them tonight.
Thank you for the info... I guess I need to get a book on fermenting... So I can better understand the process...I'm working towards a Agri Science/Nutrition degree, so I need to know the basics anyway.... Right now all that is way over my head.... Lol
I started a bigger batch yesterday and I'm using paper towels over the top... Hopefully this batch will do better... I moved it back into house to so I would remember to stir... Those stupid fruit flys LOVE that stuff!!