How much coffee grounds do you feed?
I don't bother with coffee grounds in my bins. I don't find my worms care for them. When I did, I tried putting some grounds in a corner, and the worms didn't party in it at all.
I'm also afraid of getting the bin too acidic. I get enough mites as it is, and I did notice that they are attracted to coffee grounds in the past.
Anyway, I've been asked how many grounds should be fed to a pound of worms. A large source of grounds is available, and I honestly don't know what to tell them.