King British Fin Rot & Fungus Control fish medicine
Example of Fin Rot in fish
King British Fin Rot & Fungus Control fish medicine
Example of Fin Rot in fish
King British Fin Rot & Fungus Control is a veterinary medicine containing phenoxyethanol for the treatment of fin rot & fungal infections, typically seen as "cotton-wool" like growths from fins or gills. Also stimulates regeneration & healing of torn & tatty fins. For use in coldwater & tropical aquariums. One 100ml bottle will treat up to 900 litres of tank water.

Active Ingredients: 2-Phenoxyethanol 5.66% w/w.

Available in a 100ml bottle.  
  1. Using the formula found on the carton, carefully calculate the volume of water to be treated making adequate allowance for the displacement of water by gravel, rocks & equipment.
  2. Shake bottle well, immediately before use.
  3. Using the pipette add 1ml  of Fin Rot & Fungus Control for every 9 litres (2 gals) of water. Alternatively, add 1 capful (4ml) of Fin Rot & Fungus Control for every 36 litres (8 gals) of water.
  4. Continue filtration during treatment but remove carbon filter.
  5. Repeat treatment every 24 hours while symptoms persist.
  6. Renew filter carbon.
  7. A 10% water change is recommended after the problem has been terminated.


Use medicines responsibly;

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. Not to be used with other fish treatments or medicines. Not to be used in the presence of salt.


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  • There is a small growth on my fish that resembles a tuft of cotton wool. What is it?

    Cotton wool-like growths are usually a sign of a fungal infection. Fungus is a common fish disease that can prove fatal if not treated early. Fungus is usually a secondary infection that follows on from a previous wound, infection or parasite. Fungal infections in fish are usually caused by the genus Saprolegnia. They should be treated as soon as possible to prevent the infection from spreading. King British Fin Rot & Fungus Control, and King British Disease Clear are both effective against common fungal infections (do not use these treatments together).

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