If taking the fish out is not an option here is my recommendation.

Immediately purchase some Garlic Extreme from a LFS or garlic extract from a health food store.
Soak dry food in the garlic. Dry food because it absorbs better than other foods.
Feed only garlic soaked food and feed very very often.
The idea is to get as much garlic into the fish as possible.
Also add some selcon as well.
Good Luck

oh my..I just looked at the definition for bumb, ..definitly not what I meant! I meant bomb :)

I think once the ick in the tank you have 2 options, let it be and not add any new fish for a very long time, as it is said that with time ick will exhaust itself after like 10 generations or so, not sure if it is true.

Other option is to remove the fish and treat in a QT. What is anoying with ick is that it can be mild infection and the fish go through it quite easy, but once in a while I can read about some strain of ick that are very bad and virulent and kill most fish in a tank.