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?
How long does malachite green/formalin last?
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