Hey there Maggie!
Ich isn't that difficult to cure, even though it may seem daunting. If you don't have a heater already, you're going to need to invest in one, because part of curing your fish is keeping them warm to help them get better. Since you have a one gallon, finding a good heater may be difficult, but an aquarium heating pad might do the trick. You'll just need to get a glass thermometer (they're 1 dollar at Walmart) and be sure to keep an eye on the water temperature. It should be somewhere between 76* to 80*, 80 degrees being prefered.
What you're going to want to do is buy Aquarium Salt. This is not table salt, but luckily you can get this in the fish section of any petstore or even walmart.
Since it seems he lives in a one gallon, you can keep him there. However, I would recommend removing any gravel or decor that is in there. Dose the tank with one teaspoon of aquarium salt per gallon. I know that you could technically go up to three tsps of salt per gallon, but that is a bit overboard, and 1 tsp can be typically trusted to get the job done.
Be sure to preform a 100% water change each day, be sure to scrub it down with hot water. After you're done with the 100% water change, be sure to add a tsp of aquarium salt back in. You can do this for 10 days, after that you're going to have to stop using the aquarium salt, and simply do 100% water changes each day until he is better.
Using this natural method ought to be better for him than medications, in my honest opinion. :)
Last edited by JKfish; 11-05-2011 at 10:11 AM.