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Essential Medications for Discus Fish Keeping

by Rahim Mohamed 06 Jun 2024

Discus fish, known for their vibrant colors and unique patterns, require special care to maintain their health and well-being. Keeping a well-stocked medicine cabinet is crucial for addressing common health issues that may arise. Here are some essential medications for Discus fish keeping:

1. Fenbendazole (Safe Guard)


  • Treatment of internal parasites such as nematodes, flukes, and certain protozoa.

Dosage and Administration:

  • Typically administered as a medicated food mix. Dissolve the appropriate dosage in water and mix with the food.
  • Dosage: 1 gram per 100 grams of fish food. Administer for three consecutive days, repeat if necessary after two weeks.


  • Ensure proper mixing to avoid overdosing.
  • Monitor fish for any adverse reactions.

2. Potassium Permanganate


  • Effective for treating external parasites, bacterial infections, and fungal infections.
  • Also used as a disinfectant for equipment and tank preparation.

Dosage and Administration:

  • For general treatment: 2 mg per liter of water, applied as a bath for up to 30 minutes.
  • As a disinfectant: Prepare a strong solution and soak equipment for at least 30 minutes.


  • Handle with care; it can stain skin and clothing.
  • Ensure proper aeration during treatment as it can reduce oxygen levels in the water.

3. Methylene Blue


  • Treatment of fungal infections and external parasites.
  • Useful for egg disinfection in breeding setups.

Dosage and Administration:

  • For general treatment: 1-2 drops per gallon of water.
  • As an egg disinfectant: 2-3 drops per liter of water.


  • It can be toxic in high doses; follow dosage instructions carefully.
  • Can stain silicone and other materials in the aquarium.

4. Malachite Green


  • Treatment of fungal infections, ich (white spot disease), and other external parasites.

Dosage and Administration:

  • For general treatment: 0.1 mg per liter of water. Repeat every other day for up to three treatments.
  • As a dip: 0.2 mg per liter of water for a short-term bath (no more than 30 minutes).


  • Toxic to invertebrates; do not use in tanks with shrimp or other sensitive species.
  • Handle with care as it can stain and is a potential carcinogen with prolonged exposure.

5. Metronidazole


  • Effective against internal parasites such as Hexamita (hole-in-the-head disease) and other protozoan infections.

Dosage and Administration:

  • Can be administered in food: 1 gram per 100 grams of fish food, fed for 5-7 days.
  • As a bath treatment: 10 mg per liter of water, with daily 50% water changes and re-dosing for up to 10 days.


  • Ensure accurate dosing to avoid overdosing.
  • Observe fish for signs of stress or adverse reactions during treatment.

General Precautions

  • Quarantine: Always quarantine new fish before introducing them to the main tank to prevent the spread of diseases.
  • Water Quality: Maintain excellent water quality through regular water changes and proper filtration to reduce the likelihood of disease.
  • Proper Diagnosis: Ensure accurate diagnosis before treatment to avoid unnecessary medication use.
  • Follow Instructions: Always follow the manufacturer's instructions and guidelines for dosing and administration.

By keeping these essential medications on hand and following proper fishkeeping practices, you can effectively manage and treat common health issues in Discus fish, ensuring they remain healthy and vibrant.

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