Weird black spots/patches on brown scopas tang

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my scopas tang has some blackish green patches on its head and body here are some pics what is wrong with it


http://s793.photobucket.com/user/ilanlukov/media/IMG_7204_zps0a9ocorr.jpg.html?sort=3&o=0

 

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anyone

 

[snorvich]

Black ich. See this. Be sure to oxygenate the water. Also note that this is difficult to eradicate from an aquarium once infected.