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Marine - Anti-Bacterial


Treats: Ulcers, Fin-Rot, Mouth-Rot, White Spot, Oodinium

Why? Certain species of bacteria such as Aeromonas and Pseudomonas cause fin, mouth and body tissue to be eaten away.  Early diagnosis is essential to prevent the infection becoming fatal.  

What? Marine Anti-Bacterial is an effective medicine against these bacteria. It can also be used to treat marine White Spot (Cryptocaryon) in a reef aquarium.

When? Use when fish have red wounds, ulcers, missing scales, red blotches, rotting fins or eroded mouth tissue.

White Spot: To treat White Spot, apply a single dose of Marine Anti-Bacterial followed the next day by a full 10-day course of Parazoryne.

Caution: This product will colour the water yellow. It will also stain skin and clothing, but is harmless to filter bacteria, all species of fish and is reef safe. Wait until the colour has faded, or at least 5 days, before carrying out water changes except in an emergency. Some invertebrates may lose condition when the treatment is first added, but will recover in a few days. 

Poor water quality can be the primary cause of stress and disease in fish.  Always monitor the water quality in your aquarium.

Follow the dosage instructions on the bottle label.

View our medicinal treatment rules

Test your water using Marine Lab Test Kits.




Active Ingredients: Acriflavine 26.7 mg/100 ml, 9-Aminoacridine HCl 26.7 mg/100 ml, Formaldehyde 754 mg/100 ml 

Available in the following variations:


Where to Buy?

Simplified map of the United Kingdom.


Let us calculate your dosage for you!

To make the process of using our products even easier this handy dosage calculator tells you the amount you will need to put into your system. Please ensure you also read the instructions and warnings that are written on the bottle/pack label.

Note: This calculator does not take into account water displacement such as that caused by substrate, ornaments, water features and plants etc. Therefore, please adjust the calculated volume accordingly.

I know my system's measurements and want to:

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Dosage calculator

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You’ll require*
0 ml

Double dose without invertebrates.

Single dose treatment, re-treat after 7-10 days if necessary.

* Always follow the instructions on the label. This calculator is intended to be used only as a guide to how much product you need to buy to treat your system. It does not take account of displacement caused by gravel, rocks and ornaments etc and does not include the volume of any external filtration system. NT Laboratories Ltd. will not accept any responsibility for inaccuracies or misuse of this guide.