Hi,
There is but its not generally recommended at the moment, the general concensus is that reef safe (I presume its a reef tank?) treatments arent that successful, the best way is hyposalinity, that has a very good success rate. For this however you will need a refractometer and a QT either for your fish or your live rock.
The best people to ask are Terry and Beth who are experts in this field! Until they can get back to you (I am different time zone which is why I am up and they are probably asleep!) feed your fish garlic suppliments, i.e. soak their food in garlic, it builds up their immune system, like vitamin tablets.
Any idea what brought it on? Most people think that Ich is largely caused by stress, so can you post your test results, system spec etc? Added anything new recently?
All the best,
Tim.