The moisture level of worm bin can be a real challenge to get right. Worms need moisture to breathe.
Coffee grounds are organic in matter, which makes it a perfect food source for worms. Yet, too much of a good thing always has the risk of throwing the conditions in your worm bin off kilter. This can hurt your worms. As usual, there are many factors at play.
A comprehensive list of the common worm farm problems you should be aware of, and possible solutions to resolve each of them.