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I think it also retains a layer of water that can't easily mix with the surrounding water. That layer becomes saturated with oxygen and that's when the bubbes form, as the extra oxygen can't dissolve into the water. When the water in contact with, eg a sword or crypt leaf receives dissolved O2...
It seems the aquarium trade moss balls come from Ukraine. They might be a different subspecies or variety to the Japanese ones.
https://academic.oup.com/bioscience/article/60/3/187/256937
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