In article .com,
Old Salt wrote:
HI Oz,

A good old fall back that I always keep to hand is Malachite Green.

All I've ever managed to do with that stuff is kill fish. I have much
better luck with Acriflavine. Not quite as toxic; contains no copper.

One of the problems with copper (besides being letah to invertebrates)
is it precipitates out into copper carbonate. So you need to add more.
then when the pH goes more acidic it all comes back into solution at once.

Nasty stuff.

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