Injury or Infection?

BullTerrierChild8 29

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My Sterbai Corydora has a red bulge on its eye.

I added 6 fish to my 29-gallon aquarium yesterday (2 Pictus Catfish, 4 Giant Danios which will all be "rehomed" to my 75-gallon aquarium when the time comes), and without thinking, I dumped all the contents of the bag into the tank, including the original tank water. I take full responsibility for this (of course), but it's weird that nothing happened to any of my other fish. I was also considering the option that it was attacked by the new fish, but that also seems unlikely, as the schools seem invested in one another. What's the problem and how do I fix it? Thank you!
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