Quote Originally Posted by Manky Sanke View Post
Sodium thiosulphate, or any proprietary dechlorinator, will neutralise potassium permanganate equally effectively as hydrogen peroxide but is far less aggressive to the gills, eyes and other delicate tissues. It's also almost impossible to overdose, so the modern thinking is to confine hydrogen peroxide to medical use where its aggressive action is effective at cleaning wounds and use the gentle action of sodium thiosulphate to neutralise potassium permanganate.
Thanks Manky Good to have confirmation.

Do you think it's worth going ahead with a water change and second treatment as a belt and braces measure?

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