Maybe Black Ich? A good pic is needed for a positive id.
Black Ich disease appears as small black spots distributed over the fish's body. The spots are about half the size of a pinhead or smaller. They are primarily found on the body and are are especially easy to see on light-colored body areas or on the transparent areas of the fins. Affected fish will scratch on the bottom or other aquarium objects. Other signs of the disease include lethargy, development of a pale body color, and lack of appetite. The disease is caused by a small worm known as a tubellarian. After parasitizing a fish, the worms develop on the fish's skin and gills and acquire dark pigmentation. They are freely mobile and will tend to move over the surface of the fish. After five or six days depending on the environmental conditions, they drop to the bottom of the aquarium. There they mature, with the development of the young worms within their body. Once the development of the young is complete, the adult worms burst, releasing the free swimming young that infest new host fish. The worms can be controlled with various commercially available medications. Formalin based products or those containing organophosphate compounds such as trichlorfon appear to be the best medications. In addition to the use of medications, any excessive buildup or organic material and debris should be siphoned from the aquarium several times during treatment. Since the young worms develop on the aquarium bottom, the removal of debris will aid in controlling the disease by reducing their numbers.
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38 Gallon (restarted 6-14-08 ). 30lbs LR, 40lbs LS, 10g sump/fuge with Caulerpa and Mangroves, Current 4x39w T5HO lighting, 2 Koralia #1, AquaC Remora. 2 small colonies of polyps, Cleanup crew (50 Dwarf Ceriths, 16 Florida Ceriths, 10 Nassarius Vibex, 14 Blue-leg Hermits, 1 Limpet).
20 Gallon. 15lbs LR, 20lbs Crushed Coral (replacing with LS), 65w Current PC lighting, SeaClone 100 (replacing with a Remora), Skilter 250, 2 Powersweep 212's. | 
