Fish Pen (Penicillin) 500mg is one of the most trusted and effective fish antibiotics used by aquarium hobbyists to treat a wide range of bacterial infections in ornamental and aquarium fish. Formulated with pharmaceutical-grade Penicillin, this broad-spectrum antibiotic targets Gram-positive bacteria, helping to eliminate diseases such as fin rot, columnaris, gill disease, mouth rot, and skin lesions.
Fish Penicillin is a fast-dissolving tablet that distributes evenly in aquarium water, providing efficient absorption and rapid recovery. Suitable for both freshwater and saltwater fish, it helps restore the health and vitality of your aquatic pets while maintaining a balanced and clean aquarium environment.
Key Benefits
Broad-Spectrum Bacterial Protection :
Effective against a wide range of Gram-positive bacteria, including those responsible for fin rot, gill disease, and ulcerative infections.
Fast Recovery & Easy Application :
Dissolves quickly in aquarium water for rapid treatment and can also be used in medicated feeding protocols.
Safe for Aquarium Use :
Formulated specifically for ornamental and aquarium fish, ensuring minimal impact on beneficial bacteria and water quality.
Reduces Disease Spread :
Stops bacterial growth and prevents infection from spreading to healthy fish in the tank.
Popular Choice Among Aquarists :
Fish Penicillin is one of the most popular and reliable fish antibiotics trusted by hobbyists and professionals alike.
When to Use Fish Pen (Penicillin)
Use Fish Pen fish antibiotics when fish display signs such as:
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Frayed or rotting fins and tails
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Open sores or red streaks on the body
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Cloudy or swollen gills
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Lethargy or loss of appetite
Always confirm that symptoms are bacterial in nature before beginning treatment.
Directions for Use
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Dosage: Add one tablet (500mg) per 20 gallons of aquarium water.
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Frequency: Repeat treatment every 24 hours.
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Duration: Continue for 5–10 days depending on infection severity.
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Maintenance: Perform partial water changes daily between doses.
After completing treatment, use activated carbon to remove any remaining medication.
Monitor fish closely throughout treatment for signs of improvement.
Active Ingredient
Storage & Safety
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Store tightly sealed in a cool, dry place (59°–86°F / 15°–30°C).
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Keep away from moisture and direct sunlight.
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For aquarium and ornamental fish use only.
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Not for human consumption. Keep out of reach of children and pets.
