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How long does malachite green/formalin last?

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#1 Yam


    Juvie Pleco

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Posted 20 February 2013 - 02:40 PM


Been med a fish with some fungus with Kordon that has malachite green and formalin. Works great. Just wondering how low does these chemicals stay in the water? It says in the bottle to do a water change every 24 hours if you re-dose. But if this stuff doesn't break down like anti biotics, i am thinking why bother re-dosing?


#2 Dutch


    Juvie Pleco

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Posted 21 February 2013 - 02:37 AM

I believe it doesnt break down but the formalin especially is a very heavy duty medication and I'd do the water change personally and redose it

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