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[0] Fungus [1] Saprolegnia (Water Mold) [2] Long, whitish, cotton-like growths on skin or fins; can also appear on fish eggs, uneaten food in tank or dead fish [4] Avoid damage to skin of fish from handling; avoid overcrowding, temperature variation or poor water quality, as this reduces the fish's ability to fight disease. [3] 
Treat water with a medication containing Methylene Blue, Acriflavine, Victoria Green or Malachite Green.
Diagnosing Fish Ailments: How To Analyze and Treat Problems. | PetSmart
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