newbee:
Ich has a 3 stage cycle that takes about three weeks to complete....
1) starts off as a cyst in the aquarium substraite.
2) then it enters the water column where most healthy fish will fight it off naturally as a trophozoite.
3) The adult stage is finally on the fish.
The reason you need to understand this is becuase the disappearing then coming back is part of hte cycle so don't be fooled and think the situation is getting better.
Things you can do to help out.
1) Test your water parameters, 9 out of 10 times something is stressing your fish and you need to figure out what it is. Large temperature swings over 24 hours are also something you need to double check.
2) do a large 30% water change just incase.
3) make sure fish aren't picking on each other.
4) keep them good and fat, but don't dump in alot at once, feed them numerous times throughout the day.
5) raising the temperature into the 83ish range helps eleminate the cycle in the 2nd stage.
If you have to revert to medication I have had good success personally with
Chem-Marin Stop Parasite 8 oz. - Marine Depot - Marine and Reef Aquarium Super Store in a fully stocked Reef tank. However, it is pepper based and you will need a PH test kit to make sure the PH doesn't drop.
Hope this helps and i'll stop rambling.
Brandon