Treat Goldfish Mouth Rot



There should be little confusion about what mouth rot is; the name pretty much sums up what the goldfish disease will look like. In order to treat this through proper goldfish care, it requires knowing what causes the mouth of a sick goldfish to rot. To answer that question, goldfish mouth rot is the result of a bacterial infection but it’s typically started by the presence of a parasite; check for parasites first.


Treat mouth rot by keeping stock numbers lower. this will lessen the likelihood of scraping their mouths on objects. It’s also important to keep the water clean and regularly test the water quality. When goldfish mouth rot begins to show, Ue a cotton ball to swab the infected area with hydrogen peroxide. Then an injection of Baytril is recommended. If an injection is beyond the fish keepers expertise, treat mouth rot with a antimicrobial medication. Potassium Permanganate, Fish Mox (Amoxicillin) is affective and so is Aquarium Salt. Remove the sick goldfish and allow it to heal; add a slime coat protector.

Goldfish Mouth Rot Symptoms

  • Goldfish will rub their mouths and noses against objects
  • The mouth of the sick goldfish becomes red
  • The lips then begin to separate from mouth, pulling tissue apart.
  • The mouth might collapse in on itself leaving a gapping hole.



Mouth rot caused by Columnaris

  • White spots appear on the mouth of the goldfish
  • A Cotton like growth will begin grow.
  • The mouth will rot away.



Treat with copper sulfate and aquarium salt