Ptiliidae Featherwing Beetle Treatment
I don't know anything you can do to rid them from your worm composter that won't harm the worms. On the other hand, I see them as beneficial as they are helping break down food scraps and other organic matter.
Thank you for your quick response to my question.
They’d be welcome if it was located outside. Flying through my house and dying on the windowsills isn't welcome.