How to treat ich in gold fish tank? and can i put the two fish in a small tank ?

Ich treatment is a long term process, that is because the ich medication only kills the ich at one stage of it's life cycle. The life cycle take a round 1 week.

If you can find filter safe ich medication then I suggest treating it in your main tank.

If not then use the small tank. The risk of using the same tank is that you have to ensure water quality by doing frequent water change of 75% to 100% (since it small and probably without "cycled" filtration). Also frequent 100% water change also get rid of the parasites in their free swimming stages. Always remember how much water you replace so that you can calculate the amount of medication you need to add back in.

If you're using the main tank the step are the same, just that you should change 25% to 50% every 2 or 3 days. That improves water quality (which improves the health of the fish so that it's bio-resistance can also help fight the parasite infestation) and also serve to remove the ich parasite from the water column.

Search of "ich treatment" on the web and there is also of information on this.

Ich is in the tank, in the gravel, in the water and on the fish.

Treat the whole tank and the fish.

As another poster said, the life cycle of the ich organism allows it to live through any medicating that isn't done exactly properly.

Remove any carbon or other granular filter material, cut open filter pads to remove carbon if needed.

You should vacuum your tank with a siphon cleaner at least twice during and once after the medicating period. remember to use properly treated, dechlorinated water of the same temperature as the tank.

Raising the temperature of the tank to 80 F can assist in speeding up the process by a day or so. Some people use even higher temperatures. Don't heat the tank up all in one day, No more than a few degrees per day.

You should treat the tank for at least 4 days after the last time you see any ich on the fish. That's the most important thing in my whole list.

Many people recommend adding freshwater aquarium salt to goldfish tanks. As long as you don't have snails or live plants you can usually use about 2 to 3 TABLEspoons per 10 gallons. When you do water changes only add the amount of salt based on how much new water you are putting in the tank, so a little less than 1 TEAspoon per gallon of water. Do not add salt to the water you add to the tank when water evaporates.

I have always used RidIch, and it can be used at a lower dosage , 3/4 of the recommended dose, twice a day to make it more effective and less harmful if the fish are sensitive. Make sure to do those vacuuming water changes. But the standard dose is usually fine for goldfish, especially if you can't do the twice a day medicating schedule on time every day for the whole period of about a week and a half.

There are other anti Ich medicines , but always redose after the ich leaves the fish.

If you don't have a heater, get one. Fish seem to get ich less if they are kept atleast over 72-74 F. Cold water changes can make it flare up, or a real cold night without a heater.

You probably didn't put enough drops inside. In my case I put less than the required amount inside because the stuff I use is methylene blue and it works every time

go to fish store and buy de ich

http://www.fishlore.com/NitrogenCycle.htm