Once your composting worm bin has been going for a while, you may notice other creatures like white worms, springtails, and millipedes living in your bin. This is normal, these creatures will not hurt your worms. In fact, they help the composting process.
The only bugs that may be present that pose a threat to worms are centipedes. You can tell centipedes and millipedes apart by looking at how their legs are attached to their bodies. Centipedes have only one pair of legs per segment, millipedes have two pairs.