Fish Pen – Fish Penicillin Tablets for Aquarium Use

Targeted Gram-Positive Infection Treatment | FixMox

The Fish Pen collection provides a time-tested solution for treating bacterial infections in aquarium fish. Formulated with Penicillin, this antibiotic is particularly effective against gram-positive bacteria, offering trusted results for common fish diseases such as fin rot, mouth rot, and skin infections.

Why Choose Fish Pen from FixMox?

• Gram-Positive Targeting: Penicillin is ideal for infections caused by gram-positive pathogens.

• Reliable Relief: Quickly addresses visible and internal infections with high efficacy.

• Easy Tablet Form: Tablets are simple to administer—crush into food or dissolve in water.

• Safe for Most Species: Safe when used as directed for most freshwater and saltwater species.

• Two Sizes Available:

  • 30 Tablets – Great for smaller tanks or single treatment cycles

  • 60 Tablets – Perfect for ongoing care or larger setups

Featured Products

• Fish Pen 500mg – 30 Tablets
  Trusted treatment for fin rot, tail rot, and gram-positive infections.

• Fish Pen 500mg – 60 Tablets
  Same powerful antibiotic in a value pack.

Important Reminders

• Always consult a veterinarian or aquatic expert for diagnosis and treatment guidance.

• Not for human use. Store away from children.

• Do not use in tanks with invertebrates unless advised.

Explore More on FixMox

• View all Fish Antibiotics

• Visit the FixMox Homepage

Related Products

• Fish Amoxicillin – A broad-spectrum alternative covering both gram-positive and gram-negative bacteria.

• Fish Cephalexin – A strong choice for broader coverage of gram-positive and skin-related infections.

• Water Conditioners – Help maintain ideal water quality during and after antibiotic treatment.

Frequently Asked Questions

Q: What are Fish Pen and Fish Pen Forte?
A: These are penicillin-based antibiotics used to treat gram-positive bacterial infections in ornamental fish.

Q: What infections does Fish Pen treat?
A: Common uses include treatment for fin rot, tail rot, mouth fungus, and other skin-related bacterial diseases.

Q: How should I administer Fish Pen?
A: Crush tablets into food or dissolve them directly in aquarium water, depending on tank setup and fish species.

Q: What’s the difference between Fish Pen and Fish Pen Forte?
A: The difference lies in strength—Fish Pen Forte contains 500mg per tablet, offering a higher dose for severe infections.

Q: Is Fish Pen safe for all fish?
A: Generally yes, but some sensitive species may require lower doses. Always consult an expert for species-specific advice.