Vermiculture in a bathtub
First time visiting this forum and, while I've done a search, couldn't find the answers to my questions. I'm not very knowledgeable about vermiculture altho am a long time gardener (mostly organic) and composter. I've always thought it was easier to raise worms *in my garden* rather than in a container. I often do trench composting to feed the worms.
Recently I read about using an old bathtub to raise worms in and wonder if that would be a good idea to obtain worm castings. I have an old bathtub and could use that outdoors in the summer. I'm in zone 3 so wouldn't start this until spring. I'd have to cover the bathtub, probably with a piece of plywood to keep out robins especially, because there are always a lot of them around eating worms.
Since I have a lot of worms in my garden I wonder if I could use that variety rather than buying another type. This is the type of worm I have, not sure if it can be ID'd by this pic. I've always thought they were lumbricus terrestris but I could be wrong.
So does this sound like a plan that would work to increase the amount of castings for my garden?
Would the worms I have in my garden work in this environment?
What type of bedding is recommended in a bathtub?
Advice of the experts on this forum gratefully received.