i have a 2inch regal blue tang in my reef that has ick(saw it today),cant catch it (i never fed my fish)
i have 3 other regals, 2 leneatus tang, 1 jawfish, 1 yellow,1 chevron tang,1 unicorn tang.
they are all doing fine.
anything i can do to treat it in my reef so it doesnt affect the others.
I had ick on my Purple tang and used garlic extract from GNC and within a couple days he was fine. I would soak the food in the garlic extract and then feed like normal. You may want to search the board fro garlic and see what come up.
I hope your tang recover soon with the garlic treatment, however if he doesn't, you could buy a UV sterilizer, I bought my sterilizer because my tang got ick long time ago, he recovered but when he got stressed he caughth ick again and again (you will never erradicate ick from your reef tank) so I bought the sterilizer and now my tang is happy and beautiful, I've heard that sterilizers are not good because they kill everything in the water included the best stuff nevertheless my corals still growing (torch, clavularias, mushrooms, plates, pollyps, xenias, etc...etc. I never turn off my sterilizer!