NT Labs Koi Care Malachite Green is an effective treatment for external parasite and fungus infections. Use this when fish have white growths on the body, head or fins, which may contain some green or brown discolouration. Malachite can be used in conjunction with Formaldehyde to treat fungal infections more effectively.
250ml – treats 20,000 litres (4400 gallons)
500ml – treats 40,000 litres (8800 gallons)
1 litre – treats 80,000 litres (17,600 gallons)
2.5 litre – treats 160,000 litres (35,200 gallons)