- Use this treatment when: Small white spots appear on fish (like grains of salt) Fish show irritation and rub against rocks or decorations A grey, velvety film covers the body White cotton wool-like fungus appears on body, mouth, or fins Fish show stress or unusual behavior Early treatment helps prevent serious outbreaks and fish loss. How to Use Shake the bottle thoroughly before use. Mix the required dose with 1 litre of aquarium water. Add the solution slowly into the aquarium. Example Dosage: For a 100-litre aquarium: Add 5ml on Day 1 Add 5ml again on Day 3 Add 5ml on Day 5 Add 15ml on Day 7 ⚠ Do not change water between doses unless in an emergency. Notes This product will colour the aquarium water green. It may stain skin and clothing. The green colour may take a few days to fade after treatment. Water changes can be done after the colour has faded.