Jay,

By the sounds of it you are hosting a group of mites.
Below is a copy of one of the many bits of wisdom form the pen of Kelly Slocum, I hope you find it useful.

TC

Mites (Acarina)
These tiny cousins of spiders can be among the most numerous of the visible decomposers in a healthy worm bin. There are more than a dozen species of mites potentially present in a healthy system, all with four pairs of legs, large bodies and tiny heads, and in colors ranging from white to shades of reddish brown. Some mites are predators of other insects in the system, some feed on fungi and molds, and some on the organic matter itself.
It is possible, though uncommon, for mite populations to suddenly explode to the point that they begin to stress the worms. Such mite blooms are often associated with the addition of large quantities of soft fruits and melon and can frequently be controlled by reducing the volume of these materials. Exposing the bedding surface to sunlight and drying conditions can also control excessive mite blooms, as can passing a small butane torch over the bedding surface.