Fishes having Costia usually show this symptom of 'Inflamed patches'
Carefully read though the article to find out whether your Gold Fish is having Costia.
Affected fishes often swim awkwardly, with their fins folded.
They may try to scrape them selves against solid objects. On closer examination it is possible to see an off-white film over the body with reddening of the most of the areas.
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Gold Fish sufferring from Costia
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Raise the temperature
The simplest form of treatment is raising the temperature up to 30℃ without harming the fishes.
3% Salt Dip
Put fishes in a 3% Salt dip until fishes roll over. Then quickly move them back into their own tank.
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