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Two tricks I've learned over the past few months
(slrpnk.net)
I've also used old bits of carpet to cover, they're a little better at retaining moisture and it won't blow away on a windy day. Just found the carpet discarded from a house and gave it a good rinse with the hose.
That charcoal is a great tip!
Anything related to composting, vermicomposting, bokashi, etc.
Ask any question, or show us your black gold or your family of wigglers!