The trick with ich is you need to keep ALL fish out of the display for a tleast a month and a half. 6 to 8 weeks usually.
There is another method which requires you to remove the fish and transfer them to a new clean sterilized tank every week for a certain amount of time, this will eliminate the ich as well. But is a bit more stressful to the fish.
Either way, you need to leave the display empty of all fish or you will have ich present forever unless all the fish develop a immunity to ich.
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Chad
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