Whitefin Rosy Tetra With Blister/sore On Mouth

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jimdarulah

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Hi guys, this is my first post here but I've lurked the forums for a while. Anyway, I have three Whitefin Rosy Tetras in my 29 gallon aquarium right now, and they are the first and only inhabitants aside from two Amano shrimp. Two males, and one female. The two males like to fight a lot, and the more submissive one has developed a blister or sore of sorts around his mouth, he's had it for at least three days now with no change in his behavior or change in the appearance of the sore. He still eats, swims, and battles for dominance. I'm starting to think it might just be an injury from fighting, but I figured a second opinion would be a good idea, better safe than sorry, you know? I also have a picture of the affected tetra, it's not great but it was the best I could do.

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What do you guys think? Should I just keep an eye on it for a bit? Should I hold off on getting more fish for now?
 

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