Normal earthworms, also known as "garden worms" or "lob worms," are not typically suitable for composting. These worms are typically found in soil and are not well adapted to the conditions found in a worm composting bin. They require specific conditions such as a certain temperature and pH range to survive.
The worms commonly used for composting are red worms – sometimes referred to as Tiger Worms (Lumbricus rubellus, dendrabaena veneta and Eisenia foetida). These worms are well-suited to the conditions found in a worm composting bin and they are able to consume large amounts of organic matter and convert it into nutrient-rich compost. They reproduce quickly, which helps to increase the population and improve the efficiency of the composting process.
It's also important to note that there are some earthworms that can tolerate the conditions of a worm bin, but their efficiency in breaking down the organic matter is not as good as the red worms.
For more help with your wormery and frequently asked questions pop on over to https://www.wigglywigglers.co.uk/pages/wormery-faqs. Or if you’re keen to get started or order a wormery please visit https://www.wigglywigglers.co.uk/collections/worm-composting