Where will they be fruitful and multiply?
Do they mate on the surface of the bedding and then leave their coccoons there?
Related, but possibly unrelated:
I have 2 shallow bins. One for Red Worms. Another for Canadian Night Crawlers. I've read that the red worms will be fruitful and multipy, but that I'll most likely fail to raise more Canadian Night Crawlers in captivity, especially in shallow bins.
After several months, I've yet to see any coccoons in either bin. Bummer!
I've started feeding once a week and leaving the worms totally alone in-between. I feed two different frozen then thawed foods in 1/3 of the bin each time, rotating till the entire surface has had food added. Today when I fed them, the Night Crawlers were distributed more or less evenly throughout. The red worms, on the other hand, were not to be found in certain squares, and they were concentrated in other squares. I felt like they are moving around in the bin to where the food is, till it's all gone there. Then moving on.