The garlic is more a preventative measure, once Ick is introduced into the tank even though the fish may recover from the infection it will always be a problem that's why a QT is so important. The only way to completely eliminate the parasite is to remove all the fish put them on a QT and treat them with Hyposalinity or Copper. You must leave the main display fish free for a minimum of 4-6 weeks.
It's possible that the fish may recover on their own but since your tank hasn't matured and will go thru fluctuations it's not likely JMHO.
Here's some good reading material on Ick:
http://www.petsforum.com/personal/tr...marineich.html http://www.advancedaquarist.com/issu...2003/mini1.htm