Thomas labs Fish Pen - Penicillin 500 mg 60 Tablets
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Thomas labs Fish Pen - Penicillin 500 mg 60 Tablets

Aqua Lab
SKU:
AS-10015-6
$99.99 $89.99
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Description

Thomas Labs Fish Pen – Penicillin 500mg 60 Tablets

Thomas Labs Fish Pen – Penicillin 500mg is a trusted antibiotic formulated to treat bacterial infections in aquarium fish. Each tablet contains 500 mg of penicillin, offering an effective treatment for a variety of gram-positive bacterial infections. Manufactured by Thomas Labs, this product ensures the health and vitality of your aquatic pets.

Related: Shop All Fish Antibiotics

Key Benefits

✅ Broad-Spectrum Antibiotic – Effectively combats infections like fin rot, columnaris, and gill disease
✅ High-Strength Formula – Each tablet contains 500 mg of penicillin for powerful and consistent treatment
✅ Safe for Aquatic Use – Formulated to protect fish health and maintain aquarium ecosystem balance
✅ Convenient Size – The 60-tablet pack is perfect for multiple treatments or medium-sized aquariums
✅ Trusted Manufacturer – Backed by Thomas Labs, a leader in fish antibiotics

Looking for a smaller pack? Check out Fish Pen 500mg (30 Count)

Instructions for Use

Purpose: Fish Pen is used to treat bacterial infections in aquarium fish, including popeye, gill disease, and septicemia.

Dosage:

  • Add 1 tablet (500 mg) per 20 gallons of water
  • Repeat every 24 hours for 5-10 days, depending on the severity of the infection

Cautions:
⚠ Not for human use
⚠ Remove activated carbon filters during treatment for maximum effectiveness
⚠ Perform partial water changes (20-25%) between doses to maintain water quality

For additional guidance, check out our Fish Antibiotics Guide

Ingredients

Active Ingredient: Penicillin 500 mg per tablet

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Additional Information
Short Description:
Thomas Labs Fish Pen - Penicillin 500 mg Tablets (60 Count) is a reliable antibiotic for bacterial infections in aquarium fish, including fin rot and septicemia.