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Fish Don’t Drink: This article only proves one should put medication into the food and not into the water, if one is treating an internal disease of a fish.

Mouth rot is a patch of white stuff on a fish’s lips. As the disease advances it produces toxins that erode the lips of the fish. Advanced cases get very ugly and the fish can’t eat. Names for this disease include cotton-mouth, mouth fungus, and flexibacter.

Bacterial Infections in Fish: There are many ways and many bacterial species that attack tropical fish in the aquarium. These diseases move much faster than other pathogens and can kill fish rapidly.

There is a ciliated protozoan that attacks cichlid fish internally. It is called Cryptobia. There are many species of cryptobia with considerable differences in how they present themselves.

Tetrahymena is a single celled ciliated protozoan closely related to paramecium and epistylis. It can be very similar in appearance on the fish to columnaris, ich and epistylis.

A patchy greyish-white “beat up” look on the body with some spider-webbing and a roughened appearance is indicative of Chilodonella or Costia. This is often difficult to differentiate from bullying.