I don't know about big box stores carrying springtails--but you never know what you get at one of those places

All kidding aside, it is a good idea to frequently change the water in the huimidity trays. I have seen springtails and even fungus gnat larvae hanging out there. So make sure the humidity trays, any saucers you may have under your pots, or cache pots you may have are frequently cleaned to get the little buggers
