I have been keeping them in a maggot tub and half filling the tub with garden soil. Every so often, when digging over the allotment, I will take out all the worms from the tub and discard any dead / unhealthy looking worms and remove all the soil. I'll then refill with fresh garden soil, return the worms and dig out a few more to be added to the tub.
I have kept them in moss before but the soil seems to work best. I guess that makes sense because, after all, soil is what they live in!
How do you guys keep your worms?
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