i agree with the last post to a degre, the only 2 things for ich that work are copper, which does more damage to your other crtitters and is also not good for the fish either
or hyposalinity, IMHO i would quarentine and do hypo, more effective and safer
garlic aslo sems to help(hlep not cure completely), but if they have ich i would still use hypo and use garlic as a preventative