To do a soil-less culture you need the following:
* container with a fitted lid
* a sheet of polyester batting or filter material or a soapless scrub pad for the bottom of the container to create at least 2-3 layers.
* cover this with 2-3 layers of plastic needle point.
* opaque plastic to cover the food
From there you add enough water to cover the bottom layer, food and worms are added to the plastic needle point. Feed as normal but do water changes
every month or so. Food still needs to be moisten and moldy food removed.
To harvest rinse worms from plastic.
Added bonus is the water at the base is loaded with infusorians and young worms which make great food for young fish.