I read a huge article online about treating ich with hydrogen peroxide, but it mostly killed the fish too. I can't remember too much but you can probably google it.
I know what I read was from scientists working for fish farmers and they did 3 different dosages, using saltwater mullet as test monkeys. I think they tried 75%, 50%, and 25% peroxide. The 75% killed all the fish after a half hour. The 50% killed most of the fish and most of the ich. And the 25% had good results but did not get all the ich.
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