A few of mine do that as well. They seem OK otherwise. In the short time that I have been keeping corydoras I have felt that their behaviour is difficult to assess because they do so many strange things. I have seen everything from "hopping" around, digging, surfing from waterfalls, swimming into waterfalls, lining up, swimming upside down, figuring out how to get food from the surface . . . you get the idea. In general though corydoras seem to be very active fish. Because of their active nature I would personally not want to keep them in anything smaller than a 20g long aquarium.
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