The life cycle of Cryptocaryon irritans is aproximently 3 weeks. This three weeks includes all three stages. The life cycle will speed up as the temperature raises, until it gets too hot for the C. Irritans to live (which normally kills the host, also). Raising the temperature up to 82-83 degrees F. will speed up the life cycle of the C. Irritans so the Ich would die off sooner. I would personally leave the tank fish-less for 4 weeks. Normally three weeks is the recommended time, but, four weeks just to make sure the C. Irritans is dead. After all, you wouldn't want another one of your fish to get Ich, now would you?
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Graham