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Thanks for saying @quochuy, I appreciate the feedback. I did add some moist cardboard but not close to half of the barrel. Is it important to use that much?

That much bedding material (it could be mixed with old compost, leaves etc...) is to keep the worms away from the bottom and reduce the time before first harvest.

ok that makes sense, I can add some additional material to the bottom before adding more worms. 👍