King British Methylene Blue is a longstanding treatment for aquaria, used by generations of fish keepers. This veterinary medicines is effective against a range of fungal & bacterial infections. For use in coldwater & tropical aquariums. King British Methylene Blue is also suitable for direct application to wounds or the treatment of eggs and fry.


Active Ingredient: Contains: Methylene Blue 2.44% w/w.

Available in a 100ml bottle. One 100ml bottle will treat up to 900 litres of tank water

King British Methylene Blue 100ml

£4.99 Regular Price
£3.99Sale Price
  • Carefully calculate the volume of water to be treated making adequate allowance for the displacement of water by gravel, rocks & equipment.

    Shake bottle well before use.

    Using the pipette add 1ml of Methylene Blue for every 9 litres (2 gals) of water. Alternatively, add 1 capful (4ml) of Methylene Blue for every 36 litres (8 gals) of water.

    Dispense treatment directly into aquarium water.

    Continue filtration during treatment but remove filter carbon.

    Repeat treatment every 4 days while symptoms persist.

    A 10% water change is recommended after the problem has been terminated.

    Renew filter carbon.

    If using directly on wounds, dab undiluted Methylene Blue on damaged areas using a cotton bud as a swab.

  • Storage: Do not store above 25°C. Store the bottle in the outer carton. Dispose of empty packaging and any remaining product in the household refuse. See pack for batch no. and expiry date. Warnings: Avoid contact with skin and eyes. Wash off any splashes immediately with clean water. Wash your hands with soap and water after use. Keep away from pets. Keep away from food and drink. This product will stain if spilt. This product may stain tank ornaments & silicone. Not to be used with other fish treatments or medicines. Do not use in marine aquariums.




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