Fishes having Fish leech usually show this symptom of 'Rubbing against hard objects'
Carefully read though the article to find out whether your Gold Fish is having Fish leech.
Affected fishes are very restless and try to remove the parasites by rubbing against hard objects. Closer inspection reveals the worm-like leeches. They can be upto at least 30mm long. Clinging to the body.
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