Flukes are parasites that attach to the bodies of fish, especially the gills.
Although flukes can cloud the skin color, the parasites do not usually produce a
visually noticeable effect. The most common evidence of flukes it based on
the behavior of the fish. They will brush quickly against a rock or abrasive
surface in an attempt to scratch the fluke from their body. A salt bath
may be effective using 4 ounces of aquarium salt per 10 gallons. Also
consider Prazipro by Hikari or Anti-Fluke by Aquarium Products.
For a more detailed analysis of fish diseases, visit
National Fish Pharmaceuticals