I've been just dropping in enough to saturate the food. First with the c then garlic, the garlic is strong so don't spill it. Let the pellet soak for a few minutes until the liquid is gone, too long and it turns to mush. Then I just put a little in to get them smelling it and add a little at a time as they eat it.
Also a cleaner shrimp will hel[ out removing it from the fish. Good luck and keep us posted, I want to see how people do with this treatment. I had great success with my Tang, he's the only fish I treated for ich like this and so far he's done by far the best. No wierd drugs or herbal treatment, just vitamins! I'm still in awe that it worked for me.