Up side down swimming fish at my LFS and not a Cory what is it?

I saw what looked like swimming upside down catfish or corys. They were small and brown with white spots in my LFS. I have never seen this kind of fish. They were not sick they literary swam upside down and looked like corys, but they weren't corys. Do you guys know what kind of fish this is? Why does it swim... show more I saw what looked like swimming upside down catfish or corys. They were small and brown with white spots in my LFS. I have never seen this kind of fish. They were not sick they literary swam upside down and looked like corys, but they weren't corys.

Do you guys know what kind of fish this is? Why does it swim upside down? and what does it do? (looks like your typical bottom dweller except it was only in the surface).

Are there fish like that in nature or is this fish "man made"?
I don't know, but I would be lying if I said those fish are not cool.

Thanks :)
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