6ddd20e8_Common_diseases_of_goldfish__Treatment
[Disease and Causes] Ulcers Caused by Pseudomonas and Aeromonas bacteria [Symptoms] Pinky-white open wounds, often with a white edge and sometimes secondarily infected by fungi and other bacteria. [Reason for Infection] Very poor water quality or an excessively high pH level. Minor scratches can become infected if conditions are poor. Also commonly affects newly imported Koi and goldfish. [Action] Test the water for signs of ammonia and nitrite. Conduct a large water change to reduce pollution levels. [Treatment] 
Fish lose salts quickly through open wounds, so add aquarium salt at a dose of 1-3g/litre. Use an anti-ulcer treatment. If treatment fails, a vet can prescribe stronger antibiotics.
Common diseases of goldfish
Treatment