Enchytraeus buchholzi are tiny white worms that often live inside a red composting worm bin, they are not baby red wigglers. Like the fruit fly they seem to appear out of thin air. Almost all bins eventually develop a population, the trick is keeping that population at a minimum. While they don’t really harm the red worms they do compete for the same resources. Apart from picking them out by hand you may want to alter the condition of your bin to discourage their growth. White worms and red worms enjoy very similar habitats but there are small differences that you can exploit. Temperature is one, white worms thrive in cooler temps and will die above 86 F. Red worms can tolerate these high temperatures. They will stop reproducing in acidic environments, anything below a ph of 5 will thin them out considerably. That’s a bit to acidic for red worms so it can be used as a temporary treatment only. Because both red and white worms are aerobic, anaerobic conditions will kill of both species and should be avoided in all bins.
White worms have a much shorter lifespan than the Reds, with time and a reproducing Red Wiggler population, the white worms can be pushed out of the bin.