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  1. Black skirt tetra with mass on mouth

    Tropical Fish Diseases
    One of my moms black skirt tetras has a weird white/opaque mass on its mouth. It almost looks like a rock. I have never seen anything like it before. 1. Size of tank? 10g 2. Water parameters a. Ammonia? b. Nitrite? c. Nitrate? d. pH, KH and GH? e. Test kit? No idea 3. Temperature? 78 4. FW...