powder blue tang??'s

so i recently bought a powder blue tang on saturday, after i got it to acclimate its started eating the first day when i first brought it home there were little signs of ick on the fin as each day goes by im starting to notice ick showing up but it still eats like a pig so today i went to petco and got it some garlic extreme and fed it that also, should i be worry that it would stilll get sick later on during the week or what not? i mean he still eating like a champ i also have another yellow tang in there and the yellow would sometime chase him around is this what is causing him to stress also? but they are starting to get along, what should i do?
 
ok i will, well i have been feeding him sea weed sheets been eating since day one and sometimes formula its just i dont get why the ick is showing up is this a normal thing with all tangs? i had two tangs before both had ick a week later one ate like a champ and the other one just picked at it and then obviously the other died and i still have my other one i just hope he makes it through like my yellow did before.
 
Some good info on ich that explains what it is and it's life cycle in tank's. http://forum.marinedepot.com/Topic31173-10-1.aspx

Cheers,
 
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