Fishes having Ich (White spot) usually show this symptom of 'Rubbing against hard objects'
Carefully read though the article to find out whether your Cyprinid is having Ich (White spot).
Inected fishes try to close up their fins and rub against hard objects. The parasies show up as white, pinhead-size specks on the fins and body.
Ich should not be confused with the similar white tubercles that appear on the pectoral fins and fill plates of male fishes, particularly Goldfishes, at breeding time.
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Cyprinid sufferring from Ich (White spot)
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Ich - Chemical Treatment
Use Ich cure treatment would be very effective.
Use a powerful filter
As a variant approach on switching tanks is to use a filteration/sterilazation system with a powerful flow with an efficient filter.
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