A little more than a week later, the Blue Tang is looking healthy again. I haven't medicated with anything else. I put the carbon back in, put the skimmer back on, and have been feeding him seaweed with garlic extreme. Water parameters are still excellent, so we'll see how he does. Guess the best thing to do (if they're still eating) is to let them battle it out on their own. Here's how he's looking now, and he's grown just a bit.
Thanks to all for your help with my first saltwater ich encounter.
