Been a while since you've been here? I id drill my holes larger works much better.I realize that some of these have been answered but I'll go ahead and chip another .02 into the pot. FYI, my mix is 1/2 pellets and 1/2 grain. I've only been fermenting for 4 months so I'm no expert, only my experiences talking here.
I had this problem in one of my buckets. Solution was to drill larger holes. Mine were 1/8" to 3/16" holes. Can't remember for sure.
I end up with feed in the bottom of my bucket too. Every once in a while, when I'm not feeling lazy, I backslop by pouring the juice over the top of new feed, rinse the bottom bucket and pour that on top as well.
I have tried keeping my feed completely submerged in water and just poured the liquid off the top and fed the mush. I've recently reduced the amount of water I keep in there so that I can get rid of the drainage step.
I do not strain or drain. Just scoop and feed. Sometimes it's a little wetter, sometimes drier. The chickies don't mind either way and it's easy to adjust it on the fly. Does it seem too mushy, add a little feed. Too dry, add a little water. It doesn't take very long to get your system personalized so that there's very little work in it.
Not true for me. We've gone on vacation and the only instructions I left for my inlaws for feeding was to feed the pre-portioned amounts that I already divied into buckets. It sat for 5 days with out being stirred no problem. I just started the same regimin I had always used. Didn't dump any FF or liquid.
I leave it until it's gone. Sometimes my 42 chickens will eat 2 gallons in one day without leaving a drop. The next day I'll put out a little over 2 gallons and half will be left. If more than half is left, I don't feed them anymore the next day and they can get the extra they need free ranging.
There is nothing wrong with that IMO. With no funky smells, I would stir it back in. I've had a layer like that, though not as completely covered, that just got stirred into the mix.
The white/beige stuff is feed and Mother. Reuse it in your next batch. I blast it loose with a water hose and pour it over the new feed.
It would work to do either by themselves. I ferment a mix of the two, no reason they wouldn't work seperate. I have 42 birds and 1-1/2 to 2 gallons per day is what they eat right now.