Too bad about your springtails... but if they look like they kind of teleport around (really fast short jumps), then springtails are what they are and you got some freebies in the end. Did you add anything you gathered from outdoors? It's possible they came from store bought plants too I suppose, can't say I've seen that happen though. They absolutely need moisture and if a potted plant is allowed to dry out any resident springtails will die or vacate the plant in search of water.
I have a tank about the same size as yours and get little micro population booms and busts like you have massing on the water there. Mine are from the parts of my substrate that I collected from the outdoors (partly for the purpose of introducing them).
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