NT Labs Acriflavin

NT Labs Acriflavin

NT Labs Acriflavin is a treatment for bacterial ailments such as fin-rot and ulcers in Koi ponds or quarantine tanks. NT Labs Koi Care Acriflavin is best used in conjunction with NT Labs Ulcer-Swab and Wound Seal in the treatment of ulcers and other open wounds.

All ponds will contain billions of minute bacteria. These include helpful species that breakdown the toxic fish waste in the biological filter system, and convert it into nitrate, which is then taken up by the plants. However, there are also other bacteria that live in the pond that are opportunistic invaders of stressed and wounded fish, including the species Pseudomonas and Aeromonas which will infect any cut or abrasion on the surface of the fish, and can also invade the host across the gut wall during gastro-intestinal problems.

When added to the pond, NT Labs Acriflavin will reduce the numbers of these opportunistic bacteria in the pond, thus lowering not only the chance of infection, but also the intensity of disease in already infected ponds. Acriflavin is ideal to use in hospital or quarantine tanks, but it is unwise to constantly add the treatment to the pond when the fish are healthy. This is because a background level of bacteria is essential for healthy fish to maintain their immune system.

Dosage Rates:

  •  NT Labs Acriflavin 250ml – Treats 9000 litres / 2000 gallons
  • NT Labs Acriflavin 500ml – Treats 18000 litres / 4000 gallons
  •  NT Labs Acriflavin 1 Litre – Treats 36000 litres / 8000 gallons

Instructions for use:

  • Switch off UV until all the colour of the treatment has gone from your pond.
  • Wait 10 days after the final dose before treating with any other pond medication.
  • If you feel that a repeat dose is necessary, check your diagnosis carefully, a different medication may be more suitable.
  • Do not treat with water temperatures below 10 degrees or over 30 degrees.
  • Remove any Carbon or Zeolite from the filter or pond.
  • Top up your filter with live bacteria as treatments damages filter bacteria


  • For Bacterial Ailments
  • Mild Anti-Septic Treats Fin-Rot,
  • Mouth-Rot & Ulcers
  • 250ml treats 9000 litres (2000 gallons)
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