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Why are my fish constantly swimming at the top?

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My fish are always swimming at the top of the bowl, and opening and closing their mouths. Why is this... I got them yesterday afternoon, but ever since this morning they have been swimming mostly at the top of the water and opening and closing their mouths. The only thing that I can think of that changed in the water was this morning, I used some 'Tap Safe' (which makes the tap water safe for the fish), but I put it in a small pot along with some tap water to sort of dilute it, then I put the solution from the pot into the fish bowl. Was this wrong?? Or is it just a coincidence that they are swimming at the top. I fed them a pinch in the morning and a pinch in the afternoon...