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[0] Protozoa (Skin Parasites) [1] Oodinium (Velvet Disease) [2] Golden speckled cast on skin [4] Avoid adding the water from the bag of new fish into your aquarium, and discard the water in the fish bag. Quarantine new fish before adding them to your aquarium in a separate isolation tank. [3] 
Treat water with copper sulfate.
Diagnosing Fish Ailments: How To Analyze and Treat Problems. | PetSmart
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