When fish seem stressed one of the first things you could do to solve it is test the water and then change it, as it is not uncommon for the water to be what is stressing them.
In this instance I would have to say that its likely the small tank size that is causing your problem, but I can see one other really huge problem with your tank: There is literally NO WHERE to hide. These fish need a place to hide, thus you find them in the one corner that seems to be as close to a hiding place as is possible. This is PART of why they need a larger tank than what you have there. It is not about swimming room, it is about having a home. I know if I had a home with no furniture I could live there, but I would pine everyday for at least a chair (and a computer to put in front of that chair LOL).
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