jamesbaur13, I just noticed this thread while searching for something else. I know this post is going to be flame-worthy. However, in response to your original question...
Here are (were) my methods of treating ich in my reef tank without removing the fish. I'm not saying this is the only way, or the best way, or the responsible reefkeeping way - just my experience when I wasn't able to pull the fish out of my DT. Just to clarify to any other readers, this is WHAT I DID and not necessarily what someone else should do. I had success, but that may have been due to the hardiness or the variety of fish that I have, or something else of which I am unaware. That being said:
1. Lots of variety of quality food. I fed AT LEAST twice a day, using either New Life Spectrum Thera A pellets or some sort of frozen food (pe mysis, spirulina brine, formula 1 & 2, etc.)
2. I soaked all food in the following: Selcon, Vitachem and Kent Marine Garlic Xtreme (I overdid the Kent's garlic - I probably used 3-4 times the recommended amount).
3. I used drops of Kent's garlic directly in the tank as recommended on the back of the bottle (so many drops per gallon).
4. I used a vitamin from the health food store called Beta - 1,3/ 1,6-D-Glucan from NOW Foods (100 mg Vcaps). I opened the capsules and mixed the powder in with the food and additives and let it soak a while before I fed. I also opened the capsules directly into my tank and found that my royal gramma would eat the chunks of powder directly.
5. Another food I fed - I used scissors to cut very small, bite-sized pieces of algae sheets (the kind tangs are supposed to like, but mine didn't). I soaked that in the food mixture, and the tangs would eat it.
6. I also crushed fresh garlic into the food mixture sometimes, and out of desperation, I also crushed fresh garlic into the tank itself. Wow, what a stink for anyone who doesn't like garlic!
I wish you success in treating your fish!
Here's my story about ich, if you're interested:
2 years ago (Nov 2009) I bought a used 55 gallon saltwater setup to upgrade from my 26 gallon. Before I transferred livestock from my 26 gallon, I thought I would stock the 55 gallon and thereby avoid a QT tank setup. I mail-ordered fish for the 55: royal gramma, dwarf angel, yellow clown goby. Clown goby died within days of being shipped, no visible signs of ich (although I'm not ruling out death by ich, but I think it probably had something to do with getting sucked into my overflow, and he just didn't recover).
It then seemed that a move out of the state was immanent for our family, so I thought that I'd go to Petco and buy the fish I always wanted, since I'd have to sell it all anyhow. I bought small yellow tang. I bought a small hippo tang. After intro of the hippo tang, the dwarf was dead in the morning (ich, or stress from the hippo?) After which every fish contracted ich: Royal Gramma, yellow tang, hippo tang.
Now I had a 55 gallon tank and a 26 gallon tank, and I knew that if I combined tanks, my original livestock from the 26 gallon would also contract ich.
I wasn't at a point where I could set up a third tank, and I was hesitant to have a tank with poison in it when I had toddlers around the house. So I followed the measures that I outlined for you.
My poor fish did suffer, but after the end of January 2010, not one of the three fish had any signs of ich (not even any scratching). I didn't combine tanks until the middle of June 2010. I added my 2 ocellaris, 1 red scooter blenny, and a bicolor blenny. I wouldn't have expected it of the blennys, but neither of my two clownfish have ever had symptoms of ich. The only fish I have added since is a midas blenny to replace my bicolor that I lost when I again upgraded from a 55 to a 65. Again, none of my fish has had a spot since. They are healthy and beautiful.
This weekend, I will be removing both tangs and giving them to a friend who has a larger tank. Will they be taking ich with them? When I add new fish to my tank, will they contract ich? I don't know. If it weren't considered hijacking your thread, maybe I'll post my results.
Again, I hope your fish pull through!