Aquasonics Bactonex assists in the prevention of bacterial, fungal and protozoal (Velvet, whitespot, chilodonella, Trichodina & Trichodinella) infections in fresh and salt water fish. Ideal for use when water changes are performed as a prophylactic treatment, or when new fish are added, in quarantine systems. Blue Colormophs and Urchins are adversely affected when treating with Bactonex. Remove carbon during treatment and observe good husbandry practices. Dose Rate: 10mL per 40 litres of aquarium water. Repeat after 5 days if necessary.