Restore the health of your ornamental fish with Fritz Maracyn Freshwater & Saltwater Treatment. This broad-spectrum antibiotic is specially compounded to target many common gram-positive bacterial infections that can quickly spread through home aquariums.

Why choose Fritz Maracyn?

• Broad-spectrum antibiotic – Formulated to treat a wide range of gram-positive bacterial diseases in ornamental fish.
• Freshwater & saltwater compatible – Safe for use in both freshwater aquariums and marine systems when used as directed.
• Pre-measured packets – Each packet treats 10 gallons, making dosing simple, accurate, and repeatable.
• Gradual dissolution – Designed to dissolve completely but gradually, helping maintain stable medication levels in the water column.
• Ideal for community tanks – Effective against many bacterial issues without the need to move most fish to a hospital tank.

Common issues Maracyn helps address

Fritz Maracyn is primarily effective against gram-positive pathogenic organisms commonly associated with ornamental fish disease, including:

• Fin and tail rot
• Body fungus of bacterial origin
• Popeye (exophthalmia)
• Cloudy eyes and other external bacterial infections

Always confirm symptoms carefully and follow dosing directions for best results.

Directions & dosage

Each packet treats 10 gallons (38 L) of water.

• Day 1: Add the contents of one packet per 10 gallons of aquarium water.
• Day 2: Add one packet per 10 gallons of water.
• Day 3: Add one packet per 10 gallons of water.
• Day 4: Add one packet per 10 gallons of water.
• Day 5: Add one packet per 10 gallons of water.

If symptoms improve but do not completely disappear, you may repeat this 5-day treatment one additional time. If there is no noticeable improvement after the first course, consult a fish health professional and consider alternative treatments such as Maracyn® Two and/or Maracyn® Oxy as recommended by the manufacturer.

Use & compatibility notes

• For use with ornamental fish only.
• Remove chemical filtration media (such as carbon) during treatment, as it can remove the medication from the water.
• Maintain good aeration and stable water parameters throughout the treatment period.
• Perform partial water changes as recommended between treatment courses if needed.

Package contents

• Quantity: 1 box
• Count: 10 individual treatment packets

Fritz Maracyn Freshwater & Saltwater Treatment 1ea/10 ct is a reliable option for aquarists who want a straightforward, packet-based antibiotic to help protect the health and appearance of their fish.

Additional information