BTW:
Be sure to only put a small amount of Brine Shrimp into the tank at a time, otherwise the garlic may soak out. Also, if your ich is that advanced, garlic might not help. You may need a quarantine tank and/or a good long freshwater dip. Clowns deal with freshwater pretty well... as a matter of fact, some whackos were selling "freshwater clownfish" on the net a while back... clowns that had been acclimated to freshwater with atouch of salt. I think this was cruel, but it does demonstrate that a dip probably won't kill the fish. Do a search for ich, dips, etc. in the Disease and Treatments group. Also, you should make sure that you've properly identified the illness before you treat.
HTH