They are probably springtails! As for the arthropod species, I did a bit of research, so here's some of my guesses:
A. Platyarthrus hoffmannseggii
B. Porcellio laevis
C. Trichorhina tomentosa
So those are my guesses! I'm no professional in this area but that's what I think based on my research. Springtails, though, are really great for a lot of things. They break down compost, are hunted by ants, breed super fast, and eleminate dangerous molds. Great to have in any ant/woodlouse set-up!
Currently raising:
Myrmica Rubra (polygynous 2 queen + brood)
Camponotus Modoc (single queen + brood)
Camponotus Vicinus (two single queens + brood)
Lasius Niger (single queen + ~60+ workers)
Tetramorium immigrans (single queen)
Temporarily keeping IdioticMouse26's ants/tarantula until August 12th as he is away. Thanks IM26!