Hi Melzama 
It's important to remember that heat speeds up the life cycle of the ich parasite. Since you are not using heat, eliminating the problem will take much longer.
I keep mostly corydoras and they don't seem to get ich, so I've never had to deal with it by using heat which is a method that seems to have become popular during the last few years. I seem to remember using medication and salt and treating for twice as long as suggested on the bottle.
Let me ask the other mods and see if one of the other long time fishkeepers can help you out on this.
It's important to remember that heat speeds up the life cycle of the ich parasite. Since you are not using heat, eliminating the problem will take much longer.
I keep mostly corydoras and they don't seem to get ich, so I've never had to deal with it by using heat which is a method that seems to have become popular during the last few years. I seem to remember using medication and salt and treating for twice as long as suggested on the bottle.
Let me ask the other mods and see if one of the other long time fishkeepers can help you out on this.