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They dig deep and EAT - it's their "excrement" that helps make the compost! Don't go looking for the worms, they're just busy doing their job (eating all the stuff in your bin!

"potworms won’t harm other living worm species, they do no damage to living plants. The only possible problem that could occur with potworms in a worm bin is if their population grows so large that they compete for food with the red wiggler composting worms. However, this rarely happens and potworms generally help with the composting process." Taken from this article http://www.naturesfootprint.com/community/articles/worm-bin

The compost you would be placing in the containers should not contain the worms themselves but rather the worm castings, which are collected from the vermicompost. The following articles should help, especially the one on how to harvest worm castings for you plants: https://www.gardeningknowhow.com/composting/vermicomposting Worms can be harmful if added to containers in that their burrowing can actually use up the potting soil, reducing the amount of soil needed for plant roots to survive and airing it out, which in the ground is fine but in containers that already dry out fairly quickly, this isn't good.

These articles should help you with composting with worms: https://www.gardeningknowhow.com/composting/vermicomposting/

If you are talking about soil in a box for vermicomposting, they you will need to add in other materials to reduce the nitrate. If this in soil in the ground, try planting a nitrogen heavy feeder like squash there to pull some of that out of the soil.

Yes, you can feed your worms moldy fruits and vegetables. Molds and fungi are a natural part of the composting process and are common organisms in a healthy worm system. These things will eventually be consumed by the worms and other organisms.