When I first started my worm boxes I had a big case of springtails, I added diatomatious earth after they infected a couple of my pots when I added the worm casings to my soil, they disappeared, like everyone says they are harmless in small numbers, but they are also a distraction and always on my mind, rather not have any creepy crawlers in my indoor planters,, once conditions in my worm bins were stable I never have had and issue again, they thrived when I had too much fresh food and moisture,