Methylene Blue FAQs
Do I need to change water before or after treatment?
Water changes are vital to maintaining the best possible water quality. Although not necessary, performing a partial water change before treatment will help improve overall aquarium conditions. We do recommend performing a partial water change when you have finished with any aquarium treatment.
Can Methylene Blue be used with other products in the aquarium?
Methylene Blue should not be used with carbon or other chemical filtration products. Methylene Blue can be used safely used with FishVet Acriflavine-MS.
Please note that Methylene Blue can interfere with the natural functions of nitrifying bacteria in the aquarium, as well as normal plant growth. We recommend treatment in a hospital tank.
How do I dose Methylene Blue?
1.25 oz. dropper bottle
Can Methylene Blue be used as a prophylactic?
Methylene Blue (as well as any other treatment) should not be added continually into any aquarium.
In what sizes is Methylene Blue available?
Methylene Blue is available pre-mixed in a 1.25 oz. bottle, and available as a just add water concentrate in a 4 oz., 16 oz., and 32 oz. bottle.
Can I purchase directly from FishVet?
Unfortunately not. Our products are not sold directly to the public. If your local store does not stock these products, ask them to request them from their distributor.
Send mail to
questions or comments about this web site.