King British Fin Rot & Fungus Control
King British Fin Rot & Fungus Control is a veterinary medicine containing phenoxyethanol for the treatment of fin rot and fungal infections, typically seen as “cotton-wool” like growths from fins or gills. It also stimulates regeneration and healing of torn and tatty fins.
For use in coldwater and tropical aquariums. One 100ml bottle will treat up to 900 litres of tank water.
| Active Ingredient | Phenoxyethanol |
|---|---|
| Usage | Coldwater and tropical aquariums |
| Volume per Bottle | 100ml |
| Water Treatment Capacity | Up to 900 litres |
FAQ
Can this product be used in both freshwater and saltwater tanks?
This product is designed for use in coldwater and tropical aquariums. It is not recommended for saltwater tanks.
How long does it take to see improvement in fin health after treatment?
Improvement may be visible within a few days, depending on the severity of the infection. Continued treatment as directed is recommended.
Is this product safe for fish during treatment?
Yes, it is formulated for use in aquariums and is safe for fish when used as directed.

Christopher Sharp –
Used this product after noticing cotton-wool growths on my guppies’ fins. The treatment worked quickly and the fins started regenerating within a week. Easy to mix and effective for both fin rot and fungal issues.
Karen Alsop –
My betta had a torn fin and the condition worsened before I used this. After following the instructions, the fin began to heal and new tissue grew. It’s a reliable product for fungal infections.
Phil Forsyth –
Tried several remedies before this one. The phenoxyethanol helps control fungal growth and promotes healing. Works well in a 100-litre tank with consistent dosing.