Fritz Aquatics |SKU: FAQUA-27544060
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Fritz Mardel - Maracyn Oxy - 16oz

Regular price $33.90
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Product highlights

  • For treatment of freshwater and saltwater fish
  • Controls infections by Saprolegnia and Ichthyosporidium
  • Treats infections caused by egg fungus
  • Helps treat bacterial infections
  • Non-toxic material but may react with certain people
  • Treats clamped fins, swollen eyes
  • Helps treat heavy or rapid breathing and patchy coloration

In the box

  • Fritz Aquatics Mardel Maracyn Oxy for Treatment of Fungal
    Infection in Fish (16 Oz)

Free standard shipping

*Orders placed before 3 PM EST Mon - Friday will ship the same day. Orders placed beyond these hours will be shipped the next business day. Exclusions apply. See shipping policy

Free Local Pickup

Please call for store stock availability. Requests made before 2:30 PM EST can be available for next-day pickup. Learn more

Questions? We’re Here to Help

Call or email one of our experts.

For fungal infections on fish and eggs (whitish tufts of cotton-like material) and bacterial diseases,Fritz Mardel Maracyn Oxy successfully controls fungus infections caused by Saprolegnia, Ichthyosporidium, egg fungus and related species, and common bacterial infections. It slowly releases small amounts of a stabilized oxygen-chlorine combination which, when used as directed, has an unusual ability to treat a wide variety of tropical fish diseases. Fungus infections are usually found at the site of an injury or recent attack from parasites. A true fungus infection has a cotton-like appearance similar to a mold found on fruit, bread or cheese, except that on a fish a fungus is usually white.
Highly Effective

Fungus infections are very difficult to treat and are usually secondary invaders resulting from an injury on the fish or recent wounds from parasites or bacterial infection. Once the fungus starts growing on the fish, it usually continues to grow and enlarge. Unless medication is provided, death results. Maracyn Oxy has been shown to be effective against certain gram-negative and gram-positive bacteria. Maracyn Oxy can be used to treat fish exhibiting the following symptoms like clamped fins, swollen eyes, heavy or rapid breathing, patchy coloration, or any change in behavior of the fish. All suspected bacterial infections should be treated immediately. Maracyn Oxy is not a toxic material but certain people may have a reaction. Use the following antidotes- external antidote like flood skin with plenty of water. If irritation persists, get medical attention. For eyes, flood with plenty of water and call a physician immediately. Internal antidote includes drinking large quantities of milk. Call physician. Follow dosage directions as detailed on the product packaging.

Shipping & Returns

  • Same Day Shipping


    All orders placed by 1PM( EST), Monday through Thursday, and by 11AM (EST) on Friday, are shipped same day. Orders placed outside these times will ship the next business day. We do not ship internationally or to Puerto Rico, Guam and other US territories at this time. For more details click here.

  • Free Standard Shipping


    We offer free standard shipping on thousands of items within the continental USA (this does not include Alaska and Hawaii).



  • Easy returns


    If you're not happy with your purchase for any reason, our flexible 30-day free return policy makes it easy to get a full refund. Click here to view our return policy.


Frequently Asked Questions

How do I return an item?

Returns are incredibly simple. Please log into your account, find your item you wish to return and follow the prompts to make a return. If you do not have an account, click here to find your order and make a return.

Will I receive a full refund when I return an item?

You will receive a full refund when you return an item in its original manufacturer’s packaging, undamaged and unmarked. If the item you are returning is priced at less than $35, you will be charged a 15% restocking fee. Please note you will not be refunded any shipping charges.

How many days do I have to make a return?

You have 30 days to make a return. During the holiday season, from November 1 to December 31, we extend the return window to 60 days. 

My item was damaged in transit. How do I place a return?

If your order has been noticeably damaged in transit, we strongly recommend that you refuse delivery and notify us immediately. Claims for missing items or items damaged in transit must be made within 48 hours of delivery. If there is carrier damage, please contact support@focuscamera.com with your order number and a description of the damage. 

There’s an issue with my order, what should I do?

Oh no! Please contact our customer service team so we can resolve the issue immediately. You can call us on 1.800.221.0828, email us at support@focuscamera.com, or send us a message here.

Can I exchange an item?

We do not currently offer exchanges. Please return the item you purchased within 30 days and order what you’d like instead.

If I ordered a kit, do I have to return all the items?

If you ordered a kit, you must return all components and accessories to receive a full refund.

I ordered a product that included a free item. I’d like to return it, do I need to return the free item as well?

If you ordered a product that included a free item, you must include the free item with your return. If not, your return will not be accepted and you will not receive a full refund.

Do you offer repairs?

We currently only offer camera repairs at our Brooklyn store. The item must be dropped off and collected in person as we do not accept shipped items for repair. For more information, please call our Brooklyn store on 1.718.431.7900.

What is your return policy?

Most items can be returned within 30 days for a full refund. Click here to read our full return policy.