Jay Hemdal
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Actually its kordon rapid cure and it has copper in it. It says not reef safe on the bottle.
Rapid Cure doesn't have copper in it, it is malachite green. Malachite green is just not very effective against marine ich, I know the bottle says it is, but a long history of trying malachite green has shown us it is not very effective. It does work well on costia and freshwater ich.
Jay