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I have a yellow tang for 3 months now. This morning is the first I saw it with a white stripe on both ends. . Is this something to be warried about, or is this the way they change colour when the light is off, or a fase the are going though? Or could it be stress? Anybody seen this?

Ok, I have been reading a bit again on my problem, and this is the artical I have found on it...

Head & Lateral Line Erosion Disease
From Stan & Debbie Hauter,

Identification, Cause and Treatment
This disease stems from the lateral line that fish have, thus appropriately named Head and Lateral Line Erosion (HLLE). It is also referred to as Lateral Line Erosion (LLE), Lateral Line Disease (LLD) and Hole-In-The-Head Disease. It appears as open pitted wounds around a fishes head and along the lateral line, as if something is slowly eroding away the flesh. HLLE disease in the short run is not fatal, but over the long run if the disease continues to progress the fish stops eating and becomes lethargic. The open wounds make the fish susceptible to other infections which in turn leads to the further deterioration of its health, and these secondary infections are what may eventually contribute to its demise.
What is the Lateral Line?
The lateral line is a tube running just below the surface of the skin along the sides of the body, usually marked externally by a series of pores that open out through the scales. View these fish anatomy diagrams from the Badman's Tropical Fish website to get an idea of where the lateral line is located. Even though these diagrams are of freshwater fishes, the lateral line relates in the same way to all fish species. It is a very important sensory organ. It can detect minute electrical currents in the aquarium water and also functions as a kind of echo location system that helps fish to identify their surroundings. There is usually only a single lateral line on each side of the body, but many variants of the typical lateral line may occur. For example, on the sides of the Belonidae (Needle Fish), Hemiramphidae (Half-Beak Fish), Exocoetidae (Flying Fish), and a few other fish families, the lateral line runs very low on the sides. On some species the lateral line may also be incomplete, in which case it stops short of the base of the caudal fin. It may also be interrupted, meaning that it ends and then recommences after a gap, perhaps several scale rows lower down on the body, as in some of the Labridae (Wrasse) species. Strangely enough, in a fairly large number of families the lateral line is absent altogether.

Possible Causes
There are many "theories" as to why this disease occurs, but there seems to be no single definitive answer that can be pinpointed or solely connected to it. Many of the contributing theories include stray voltage in the aquarium, poor water quality and environmental conditions, high nitrate levels, lack of vitamins and poor nutrition, stress, parasitic infestation (a protozoan, Octomita necatrix), using carbon, and that some fish may just be genetically pre-disposed to this disease condition, such as Tangs & Surgeonfishes (refer to sixth discussion down).

Treatment
Most of the above possible causes can be easily addressed. Stray voltage induces stress, so adding a grounding probe to the aquarium is a wise thing to do in any case. For poor water quality and environmental issues, follow good regular aquarium maintenance routines. Reduce and eliminate any other stress inducing factors, correctly diagnosis for parasites and always feed fishes foods that any particular species require in their diets.

Using over the counter medications do not seem to do much in treating this disease. However, those that contain antibiotics can help to treat for secondary infections. From all the research we have done, no matter what the actual "cause" may be, it appears that improving water quality and providing supplemental vitamins and adequate nutrition are key elements in "treating" HLLE. Many aquarists have had great success in reversing the effects of this disease by providing the fish with supplemental vitamins, such as A, D, E or B's, as well as iodine. This can be accomplished by feeding them foods soaked in Selcon, Zoe or other liquid vitamins, providing algae eating species with vitamin-rich live plant sources, such as macroalgae, i.e. Caulerpa (refer to the third discussion down) and adequate live rock growth, and even by feeding a diet of broccoli supplemented with peas and other prepared foods.

For more information about this disease, refer to our HLLE Disease Resources.


So if somebody else have this problem here you go.