Hi I have been reading this thread for a few weeks,am still on page 331 but have been doing FF for near to a month.I love it. I do FF for chickens,ducks,turkeys and my goats! I do it a bit differently i have 5 8ltr house bucket and a large 20 ltr tub for goats. I have no holes I started a ferment with whole grains,ACV,and water and leave at least 36 hrs and pour off excess liquid to new bucket,top with water andstart again till have my permanent 5 buckets going,just backslop all daily and top with water,have only added new acv once and not because of any smell or problems but just thought i should.
My goats drink about 3 ltrs of ferment liquid daily,just slurp down and they h=look great,shiny coats,less lameness and creaking in older does.
My ducks love there food swimming in liquid.After tipping off excess ferment liquid before feeding i just retop bucket with water and that with the ferment still in feed (I don't drain just tip off excess) makes up the liquid i put in with grain into feeders.They are far better foragers with FF.
BTW I live in NZ and grains for FF are hard to find and can be very expensive!