Buy some cleaner shrimp and feed the fish well. I don't think the shrimp actually get rid of the ich, but they do help with the white spots and I think this helps the fish recover faster. Adding a UV is a good idea if you have the cash.
Some people have had good luck removing the fish and treating them, but it has always wound up in death for me. The fish were already so sick that chasing them around the tank and moving them stressed them enough to do them in completely.
The moment his HEAD is in view, hit it with the LIVE ROCK!