API Bettafix is a safe, all natural anti-bacterial medication for use on wounds, ulcers, mouth fungus and fin and tail rot. Use whenever Betta exhibit signs of bacterial or fungal disease, such as red ulcers, frayed or torn fins, slimy patches or cottony growths. Bettafix also heals open wounds and tissue damaged by handling, netting and fighting; promote rapid re-growth of damaged fins and skin. Contains the healing power of Melaleuca (tea tree), a botanical extract. Treats up to 20 gallons.