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I cured ich in my son's 10gal with just temps of 88 F .... it's best you add an air-stone or ensure you have plenty of surface movement as warmer water holds less oxygen. PWC's and gravel vacs will be critical in helping to remove the parasites.
I left the temp at 88 F for one week AFTER I saw the last sign of ich ... just to ensure you eradicate it thoroughly. In all took just under two weeks.