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Betta Fish Diseases Flexibacter columnaris (Cotton Mouth) Bacterial Also known as; Cotton-Wool, Cotton-Mouth, Flexibacter, Columnaris, Mouth Fungus. Description: Often mistaken for a fungal infection because of its mold-like lesions, Columnaris is a common bacterial infection in cultured fish, particularly livebearing fish and catfish. Its name is derived from columnar shaped bacteria, which are present in virtually all aquarium environments. When fish are stressed by poor water quality, poor di…
Betta Fish Care