Avoiding acid in worm beds.
(Liverpool, NSW, Australia)
I've seen cautions many times about not feeding citrus and several other foods to compost worms because of the acid problem.
I've always fed any vegetable matter I can find, in moderation, and my worms are still doing fine ten years on.
But, if feeding known acidic foods, I always add a few eggshells crushed and sprinkled in with the feed.
Crushed eggshells will always assist in keeping the acidity low.
Gardeners' dolomite, snail shells, seashells (rinsed to remove the salt) or chalk will do the same job. Also dark green vegetables such as broccoli and kale contain significant amounts of calcium carbonate.
So, it's not really difficult to avoid an acidic worm bed while feeding almost anything.