6ddd20e8_Common_diseases_of_goldfish__Treatment
[Disease and Causes] Bacterial infection Caused by Aeromonas and Pseudomonas bacteria [Symptoms] Reddening of the skin or fins; ragged fins with signs of infection, open sores. Common on many newly imported fishes. Often accompanied by other diseases, including fungi. [Reason for Infection] Poor water conditions, especially the presence of ammonia and nitrite. Wounds resulting from poor handling, transport or fighting may become secondarily infected by these bacteria if conditions are poor. [Action] Improve water conditions, and treat promptly. [Treatment] 
Use a proprietary treatment as soon as possible. Aquarium salt at a dose of 1- 3g/litre can help prevent salt loss. Severe infections may require prescription medications from a vet.
Common diseases of goldfish
Treatment