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Fuzzy mouth?


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The fish in the center (the least blurry one) appears to have some white fuzz attached to it's mouth/chin. A few of the other danios look like they may have some on their lips too, but this one is the worst. Possibly breathing a little heavy, but all have been active and eating.

Tank parameters:

73-74 F depending on the thermometer.

Testing with coop strips

Ammonia: 0ppm

Nitrate: 25ppm

Nitrite: 0ppm

GH: over 300ppm

KH: 60-80ppm

PH: 6.6-6.8

These have been stable pretty much since setup.

Meds on hand are Ich-X, Fritz ParaCleanse, and Fritz Maracyn.

These guys were just added to my display tank on August 17th and underwent a full month of QT with the med trio at the start, no signs of illness during that time.

I have such a hard time trying to Google fish illnesses. What do you guys think this is and how should I treat it?

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Looks to me like columnaris, in the form of mouth rot. Two fish in the pic look to have it. I have had success with Triple Sulfa, though it isn't available anymore. You can try Seachem's Sulfaplex, though I have no experience with it.

Another option is Kanaplex+Jungle Fungus Fizz tabs.

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