If you'd read my disease primer stickied in the disease forum you'd know that an aquarium without fishes for two weeks will eliminate the disease. If the motile parasites can't find a fish to infect in time they die, some in days, some in a week or so. Two weeks sans fishes = no Ich. You need not worry about your plants, just time is necessary to eliminate Ich in tank in which the fishes have been removed.
When a finger points to the moon, the imbecile looks at the finger.
Omnia mutantur nihil interit.
The more you read, the more things you will know. The more that you learn, the more places you'll go