What could have caused this overnight? I added some onion and garlic skins yesterday along with some coffee, really just the papery skins though, not actual onion. Is it possible I just had the lid pushed down a little too hard and enough air flow wasn't getting through? Should I consider leaving the lid off for a day to encourage the worms to burrow and air things out??

I stirred things around a bit and saw very few mites compared to what I hear in some others posts and maybe one or two fruit flies, nothing major. Underneath the top couple inches was a lot less moist and the more proper consistency that normally is throughout my bin.

I forgot to follow that rule for the last week and a half when I had constantly checked my bin to dispose of a ton of seedlings that sprouted in my bin. Soon the worms began disappearing and squeezing into the bottom drainage area, and they became very very sluggish.