Fish Pen - Penicillin 500mg 30 Tablets
$59.99 $79.99
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Fish Penicillin - Fish Pen 500mg (30 Tablets) | Aquarium Antibiotic
High-Potency Treatment for Fin Rot, Gill Disease & Other Bacterial Infections
Fish Penicillin - Fish Pen 500mg (30 Tablets) is a broad-spectrum fish antibiotic designed to combat gram-positive bacterial infections in freshwater and saltwater aquariums. Each tablet delivers 500mg of penicillin, an effective treatment for fin rot, gill disease, columnaris, and septicemia. This trusted aquarium antibiotic ensures safe and efficient bacterial infection control without disrupting the aquatic environment.
Key Benefits
✔ Broad-Spectrum Antibiotic – Targets fin rot, columnaris, septicemia, and gill disease in aquarium fish.
✔ High-Potency Formula – Each 500mg tablet delivers a strong and consistent bacterial treatment.
✔ Safe for Aquarium Use – Specifically formulated for freshwater and saltwater environments, ensuring ecosystem balance.
✔ Convenient Packaging – Includes 30 tablets, ideal for single or multiple treatments.
✔ Trusted Quality – Manufactured under strict quality standards for purity and effectiveness.
Dosage Instructions
✔ Add 1 tablet (500mg) per 10 gallons of aquarium water.
✔ Repeat every 24 hours for 5-10 days, depending on infection severity.
Usage Tips & Cautions
✔ Remove activated carbon filters during treatment for maximum effectiveness.
✔ Monitor water quality and perform 20-25% water changes between doses.
✔ Not for human use.
Ingredients
- Active Ingredient: Penicillin 500mg per tablet.
Related Products
- Fish Pen Forte - Penicillin 500mg (60 Tablets)
- Fish Mox - Amoxicillin 500mg (100 Capsules)
- Fish Zole - Metronidazole 500mg (60 Tablets)
- Bird Biotic - Doxycycline 100mg (30 Tablets)
- Fish Flox - Ciprofloxacin 500mg (60 Capsules)
Fish Penicillin – Treating “Mouth Fungus” (Columnaris) and Fin Rot

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- Orders placed Monday-Friday before 2pm Central Time usually ship the same day.
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