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Swollen Mouth Praecox Rainbowfish Only Staying At The Top

Sunny Doan

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Any help? My female praecox rainbow developed some weird swelling on her lower jaw and is only staying at the surface of the water. I just did a water change yesterday but im not sure what could be affecting her. The male praecox is doing fine and the guppy fry in there are doing great too. Water temp is at 80 degrees, but I brought it down to 75. 

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