Kordon Malachite Green – 4 oz
Kordon’s Malachite Green is an effective medication used for the control of various external parasites of freshwater and marine fishes. When used as directed, the medication will control or prevent the following common protozoan parasites: Ichthyophthinus (freshwater Ich), Costra, Chilodonella, Ambiphyra, Cryptocaryon (marine Ich), Epistylis, Oodinium, and Trichodina.
Kordon’s Malachite Green is also effective against common external fungal infections of fishes and eggs, including Achlya and Saprolegnia. An extensive body of literature supports its use as an effective agent in the control of fungus on fish eggs.
Key Features
| Active Ingredient | Zinc-free chloride of Malachite Green |
|---|---|
| Concentration | 0.038% |
| Application | External parasites and fungal infections in freshwater and marine fish |
FAQ
What parasites does Kordon Malachite Green target?
Kordon Malachite Green targets external parasites such as Ichthyophthinus (freshwater Ich), Costra, Chilodonella, Ambiphyra, Cryptocaryon (marine Ich), Epistylis, Oodinium, and Trichodina. It is also effective against fungal infections like Achlya and Saprolegnia.
Is this product safe for fish eggs?
Yes, Kordon Malachite Green is supported by literature for its effectiveness in controlling fungal infections on fish eggs.
What is the concentration of Malachite Green in this product?
The product contains a 0.038% solution of zinc-free chloride of Malachite Green.

John Gill –
Used this product to treat a freshwater fish with Ich. The treatment worked within a few days. My fish showed improvement after the first week. The instructions were clear and the product dissolved easily in the tank water.
Kevin Davidson –
Tried it on a marine fish with fungal infection. The fungus cleared up after a full treatment cycle. It’s effective but requires careful dosing to avoid overexposure.
Nathan Bond –
Helped prevent a potential outbreak in my community tank. I used it as a preventive measure during a temperature change. The fish seemed healthy after treatment.