The basic outline for ich is to put the fish into a qt and adjust the salinity to sg=1.009 and leave the dt empty of fish for 6 weeks. The details of how to do this are located in the FAQ at the top of this forum. How sure are you of your diagnosis? Take a look at the FAQ for pictures of ich-infested fish for comparison, and check your water parameters - sick fish need high quality water if they are to survive.