Code: INT396A traditional aquarium water treatment acting against a variety of disease organisms. A popular traditional medication which is dye based. Harmless to all species of fish. This 100ml bottle contains enough to treat 500 Litres (110 gallons). Methylene Blue is one of the traditional aquarium treatments. it is used to treat a variety of fish diseases. It should be noted that this can effect both plants and filters. Use Methylene Blue to prevent fungus on fish eggs, to reduce toxicity of nitrite in aquarium water or as a treatment for protozoan parasites and fungus on fish. There is a handy pipettte and measuring cup, their is also a chart to calculate the required dosage as well as a chart to aid diagnosis of alternative fish problems.