Did you do what I suggested about looking at the fish closely to confirm or rule out ick? [See above, my suggestion].
If you are sure it is ick, then setup the hospital tank and then treat using hyposalinity. No medication. Note, that if you are dealing with ick, then all of your fish should be treated as they have all been exposed, whether they are symptommatic at this point or not.
Hyposalinity: Make sure that the ph and temperature in your hospital tank equals that of your tank. Over the course of 48 hrs, incrementally drop the salinity in your hospital down to 1.009. Keep a watch out for PH drops in particualarily due to the hyposalinity. Feed your fish garlic soaked food and, if you can get some Zoe supplements, use this as well. Once the ick cycles into the free-swimming stage, then the reduced salinity will kill the parasites off. Continue the hyposalinity for 3 weeks AFTER all signs of disease have disappeared from your fish. If all is well, then, over the course of another week, reaise the salinity in the hospital tank back up to normal levels. This should do it.
Again, make sure you are dealing with ick.