Fritz Marbel Maracyn Oxy (16 OZ / 473 ML)

Fritz Maracyn Oxy is a fast-acting, non-antibiotic liquid treatment designed to eliminate true fungal infections and certain bacterial diseases in both freshwater and saltwater aquariums. Fungal infections—often recognized as fuzzy, cotton-like white growths on the fins, mouth, or body—commonly take hold after fish suffer a parasite attack or physical injury. Maracyn Oxy works by slowly releasing a stabilized oxygen-chlorine combination that targets fungal pathogens and harmful bacteria on contact without disrupting your biological filter, discoloring your water, or requiring carbon removal.

Key benefits

• Effective Fungal & Bacterial Treatment: Quickly controls true fungus infections (such as Saprolegnia and Ichthyosporidium) as well as egg fungus and mild bacterial infections.

• Non-Antibiotic Liquid Formula: Offers a gentle yet highly effective alternative to traditional antibiotics, preventing the development of drug-resistant pathogens.

• Safe for Most Invertebrates: Formulated to be safe for plants, shrimp, snails, crabs, and other invertebrates (not suitable for starfish or related echinoderms).

• Does Not Impact Biological Filter: Extensively tested to ensure it has no adverse effects on beneficial, nitrifying bacteria strains.

• No Messy Cleanup: Liquid dose dissolves instantly without staining aquarium decorations, clouding the water, or requiring you to remove activated carbon from your filter.

Specifications

• Size: 16 fl oz (473 mL)

• Total Treatment Capacity: Treats up to 1,888 gallons (7,147 liters) of water

• Form: Liquid

• Water type: Freshwater and Saltwater

• Manufacturer Item Number: 44060

Suggested use

• Dosing instructions: Add 1/2 capful (2.5 mL) per 10 gallons (38 L) of aquarium water. For smaller setups, use 5 drops per gallon.

• Treatment duration: Repeat dosing daily as needed for up to 5 days. Do not perform water changes during the course of treatment.

• Equipment adjustments: Switch off UV sterilizers and ozone generators during treatment. Protein skimmers may remain running but should be monitored for excessive foaming.

• Filtration: Normal mechanical and chemical filtration (including activated carbon) can remain active during treatment.

• Overdose relief: If an accidental overdose occurs, neutralize the medication immediately using an aquarium dechlorinator (such as Fritz Complete, FritzGuard, or Fritz A.C.C.R.).

Ingredients

• Active Ingredients: Stabilized oxygen-chlorine combination.

Guaranteed analysis

• Stabilized Chlorine Dioxide / Oxygen-Chlorine Compounds: Concentrated liquid formula.

Storage and safety

• Store in a cool, dry place away from direct sunlight.

• Keep the bottle tightly closed when not in use.

• Keep out of reach of children and household pets.

Warnings

• For aquarium fish use only. Not for human consumption.

• Do not use with starfish, sea urchins, or related echinoderms.

• First Aid: In case of skin contact, flood skin with plenty of water. For eye contact, flush eyes immediately with water and contact a physician. If swallowed, drink large quantities of milk and seek immediate medical attention.

What’s included

• 1 x Bottle of Fritz Mardel Maracyn Oxy (16 oz / 473 mL)

Why choose

Fritz Maracyn Oxy provides a clean, stress-free path to recovery for sick fish and infected eggs. Because it relies on a specialized oxygen-chlorine compound rather than heavy antibiotics, it targets fungal growths quickly without threatening your tank's biofilter or staining your equipment. The 16 oz bottle is the perfect size for larger aquariums or multiple tanks, delivering highly effective, broad-spectrum protection that keeps your aquatic environment clear and healthy.