Answer: If the worms are short and fat, they're likely the immature larvae of a ground beetle. They won't cause any harm to your compost or garden soil. In fact, predacious ground beetles feed on slug eggs and are most welcome in my garden! If the worms are long and thin, they may be a type of worm called entrachyadids. They will not hurt compost worms but they do indicate acidic conditions, which can be overcome by the regular addition of a handful of lime. Hope this helps you identify the critters in your compost.
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