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You won't kill them. I've administered the treatment on several species and know countless others that have as well.
It does depend on species. All but one of my healthy rosy barbs died due to heat last summer. They were okay at 82 but started dropping quickly at 86.

Each to their own tho. I've always used a copper medication and never heat to treat ich, as I have certainly seen heat stress in fish.
 
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