Found living in my Hermit crab's water bowl, in both the freshwater and saltwater side. Live on the surface of water in rafts made up of many individuals, no apparent coloring like you'd expect in Ponura and other aquatic springtails, full-size adults seem to be a grey color. Inaturalist Observation with additional photos: https://www.inaturalist.org/observations/269351011

VERY SMALL, like under 1/4th the size of a cotton springtail (Entomobrya unostrigata)