Columnaris (Cotton Wool Disease, Flex, Flexibacter)

Betta Columnaris

What is Columnaris? Columnaris disease is caused by Flexibacter Columnaris bacteria. It has many nick names including cotton wool disease, cotton mouth, flex or mouth fungus. It is a disease that is often mistaken for a fungal infection due to lesions that have a mold-like appearance. Infection occurs in  fish that have been stressed out […] Read more »