help w/ black ich on y. tang

[freewilly2]

i have had this problem for a week now. ive been soaking the food in garlic before feeding them the frozen shrimp. is there anything that i can do to cure this problem with my tang.
ive only noticed it on my y. tang and nothing else. please help

 

[kevin2000]

http://www.petsforum.com/personal/trevor-jones/blackich.html