Kordon Methylene General Disease Prevention, 4 fl oz

Kordon Methylene General Disease Prevention is a 4 fl oz methylene blue treatment for aquarium fish. Kordon says Methylene Blue is effective against superficial fungal infections of fishes and is safe for use with fish eggs and fry for the prevention of fungal infections.

Quick facts

• Species: Fish
• Size or dimensions: 4 fl oz
• Material or key ingredient: Methylene blue

Why owners like it

• Kordon says Methylene Blue is effective against superficial fungal infections of fishes.
• The brand says the drug may be used as an alternative to Malachite Green for the control of fungus when it is known that the fish to be treated are sensitive.
• Kordon says Methylene Blue is safe for use with fish eggs and fry for the prevention of fungal infections.
• As a secondary use, the brand says it is effective against some external protozoans, such as Ichthyophthirius (Ich), Chilodonella and Costia.

Kordon says treatments should be carried out in a separate hospital tank or other suitable container. The brand cautions that methylene blue is toxic to plants and is harmful to biological filtration, preventing nitrification and resulting in a rapid rise in ammonia and/or nitrite levels. Kordon adds that methylene blue can permanently color the silicone sealant in aquariums.

Questions owners ask

Where should treatments be carried out? In a separate hospital tank or other suitable container, according to Kordon. The brand also cautions that methylene blue is harmful to biological filtration.

Is it safe for use with fish eggs and fry? Kordon says Methylene Blue is safe for use with fish eggs and fry for the prevention of fungal infections.

Does it have a secondary use? Kordon says that as a secondary use it is effective against some external protozoans, such as Ichthyophthirius (Ich), Chilodonella and Costia.