Fritz Maracyn Oxy 16 fl oz Broad-Spectrum Aquarium Fish Treatment

Fritz Maracyn Oxy is a broad-spectrum aquarium treatment designed to help treat common external bacterial and fungal infections in freshwater and saltwater aquariums. It is commonly used for issues such as fin and tail rot, body sores, external bacterial infections, fungal growth, and cotton-like patches on fish.

Maracyn Oxy uses an oxygen-based formula to help target external infections while supporting a cleaner aquarium environment during treatment. It can be used in hospital tanks and may be used in display aquariums when dosed correctly, but sensitive livestock should always be considered before treatment.

Key Benefits

Helps treat external bacterial and fungal infections
Useful for fin and tail rot, body sores, and cotton-like fungal growth
Oxygen-based aquarium treatment
For freshwater and saltwater aquariums
Prefer a quarantine tank when practical; not suitable for starfish or related echinoderms; follow the label for other livestock
Trusted Fritz Aquatics fish medication
Helpful product to keep on hand for aquarium health concerns

Treats

Fin and tail rot
Body sores and ulcers
Cotton-like fungal growth
Mouth fungus / cotton mouth
External bacterial infections
External fungal infections
Bacterial lesions

Directions for Use

Dose 2.5 mL (half a capful) per 10 US gallons, or 5 drops per gallon for smaller tanks. Repeat once daily only if symptoms persist, for up to 5 days.
Do not remove activated carbon; keep normal filtration and adequate aeration running. Turn off UV sterilizers.
Increase aeration during treatment.
Do not continue beyond five days. If symptoms persist on day 6, Fritz recommends evaluating another treatment rather than repeating Maracyn Oxy.
Avoid water changes during the treatment course.
Monitor fish behavior and water quality during treatment.

Important Note

Always follow the manufacturer’s dosing instructions carefully. During any medication treatment, monitor ammonia, nitrite, and overall fish behavior closely. If possible, treating sick fish in a hospital tank is often the safest option.

Product Details

Brand: Fritz Aquatics
Product Name: Maracyn Oxy
Size: 16 fl oz
Use: Freshwater and saltwater aquariums
Treatment Type: External bacterial and fungal infections
Application: Aquarium fish medication

FAQ

Can Fritz Maracyn Oxy be used in reef tanks?

It is best used in a hospital tank. Use caution in reef aquariums, especially with corals and sensitive invertebrates, and always follow Fritz guidelines.

Is Fritz Maracyn Oxy safe for invertebrates?

Fritz lists Maracyn Oxy as safe with most invertebrates but not starfish or related species. A hospital tank is preferred when practical.

Can Maracyn Oxy be combined with other medications?

Fritz lists no contraindications with its other aquarium medications; follow all relevant labels and seek qualified advice for combination treatment.

Will Maracyn Oxy affect beneficial bacteria?

Fritz states that Maracyn Oxy does not inhibit nitrifying bacteria. Maintain normal filtration and aeration and continue monitoring water quality.

Is Fritz Maracyn Oxy safe for freshwater fish?

Yes, Fritz Maracyn Oxy can be used for freshwater fish when dosed properly according to the label directions.

Should I use Maracyn Oxy in a hospital tank?

A hospital tank is recommended whenever possible. It allows you to treat sick fish separately, protect sensitive tank mates, and monitor the fish more closely during treatment.

Shop Fritz Maracyn Oxy at Tropical Treasures Wyo

Fritz Maracyn Oxy is a helpful fish medication to keep on hand for external bacterial and fungal concerns in freshwater and saltwater aquariums. Shop Fritz Maracyn Oxy 16 fl oz at Tropical Treasures Wyo in Cheyenne, Wyoming.

Important Invertebrate Safety Warning

Do not use with starfish or related echinoderms. Fritz's published product information does not impose a blanket prohibition on all invertebrates. When treating aquariums with shrimp, snails, crabs, corals or other sensitive livestock, confirm the current package directions and consider a separate hospital tank. Maintain strong aeration, monitor all livestock, and do not exceed the labeled treatment period.