The store will not work correctly in the case when cookies are disabled.
Bulk Reef Supply Saltwater Logo
Bulk Reef Supply Freshwater Logo

FREE SHIPPING: Dry Goods Orders $49+ & Live Animal Orders $179+

Skip to Content
Menu BRS Freshwater
My Cart
    • My Account
    • My Wish List
    • My Orders
    • Address Book
    • Sign Out
    • Reward Points
  • Sign In
Bulk Reef Supply Mobile Menu
Close

Quick Links

  • DEALS
  • Gift Cards
  • What's New
  • Education
  • Clearance
  • Open Box
  • PR Rewards
  • Shop Brands
  • FAQs
  • Saltwater
Menu
Weekly Deals Weekly Deals
Sign up to be a Reward Member Earn Reward Points
Returns 365-Day Returns
Experts Aquarium Experts
  • Weekly Deals Weekly Deals
  • Sign up to be a Reward Member Earn Reward Points
  • Returns Risk-Free 365 Day Returns
  • Experts Aquarium Experts
Loading...
Fritz Aquatics

Maracyn Oxy Fungal Fish Treatment

Be the first to review this product
Grouped product items
No options of this product are available.
Add to Wish List
Risk Free 365 Returns

Your Satisfaction Guaranteed With
365 Day Risk Free Returns

No longer need what you ordered? Ordered one too many? We've got your back.


Return new, unopened products in original packaging within 365 days for a full refund.

Under 60 days? No problem. We’ll issue your refund to the original form of payment. Over 60 days? Still no problem. We'll issue your refund in the form of store credit, which you can use like cash on our website.


Return unused, open box products within 30 days.

Open box but still unused? We can help. We’ll issue your refund to the original form of payment minus a small 10% restocking and handling fee.

Some exclusions apply, for more information go to Return & Replacement Details.

Skip to the end of the images gallery
main product photo
Skip to the beginning of the images gallery
Details

Highly effective, non-antibiotic treatment for true fungal infections and bacterial diseases

Fritz Maracyn Oxy can be a powerful tool in controlling true fungal infections that can result from injuries or other diseases such as ich, and has also been found to be effective against certain 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.

 

Features

  • Effective treatment for fungal infections
  • Non-antibiotic treatment

 

Available in Two Sizes

  • 4 Oz
  • 16 Oz

 

Fritz Maracyn Oxy can be used to treat fish exhibiting the following symptoms: 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.

 

Fungal infections are usually found at the site of an injury or recent attack from parasites. A true fungal 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. Fungal 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. Fish are typically unable to heal from this type of infection on their own, and left untreated are not likely to survive.

 

Directions

The use of a hospital tank is recommended. Switch off UV sterilizers during treatment.

  • Use 1/2 capful (2.5 mL) per 10 gallons of water. Repeat as needed for not more than 5 days.
  • It is suggested to always increase tank aeration during treatment to ensure an adequate oxygen supply for sick fish.

 

Note: Not suitable for use with starfish or related species. Should fish exhibit signs of distress neutralize the medication by using an aquarium dechlorinator. Consult a veterinarian or fish expert for assistance in diagnosis of disease-causing organisms and treatment options.

 

CAUTION: Fritz Maracyn Oxy is not a toxic material but certain people may have a reaction. Use the following antidotes:

  • External antidote: 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: Drink large quantities of milk. Call physician.

 

 

More Information
More Information
SKU Maracyn Oxy Fungal Fish Treatment - Fritz Aquatics
Aquarium Type Saltwater, Freshwater
Reviews
Write Your Own Review
You're reviewing:Maracyn Oxy Fungal Fish Treatment
Your Rating
Product Questions

Product Questions

No questions yet. Be the first to ask the question!

SIGN UP TO JOIN THE COMMUNITY & STAY CONNECTED

Our email newsletter is your front-row seat to the best deals, educational videos, new products and more.

Sign Up Now
BRS Fresh https://media2.cdn.bulkreefsupply.com/media/logo/stores/1/BRS-Logo-498x174.png https://fresh.bulkreefsupply.com/
BRS Fresh Bulk Reef Supply
  • Facebook Opens a new window
  • Youtube Opens a new window
  • Instagram Opens a new window
  • TikTok Opens a new window

Contact

  • 763-432-9691

  • 8am - 6pm CT M-Th
    9am - 4pm CT Friday
  • support@bulkreefsupply.com
  • 6325 Sandburg Road, Suite 200
    Golden Valley, MN 55427 US

About Us
About Bulk Reef Supply
Careers
Mr. Chili Sustainability Alliance
Affiliate Program
Terms & Conditions
Customer Center
Contact Us
Preferred Reefer Program
Returns & Replacements
Payment, Pricing & Promos
Shipping & Delivery
Wholesale Customers
APL Star Logo
© 2026 Aperture Pet & Life. All Rights Reserved.
Privacy Policy

item(s) Added to Your Cart

Product Name

View Cart Checkout Now
You may also like
BRS Fresh Hat
Bulk Reef Supply
BRS Fresh Hat
$24.99 $24.99

African Cichlid Mix - Original Substrate 20lbs
CaribSea
African Cichlid Mix - Original Substrate 20lbs
$15.70 $15.70

AquaPlus Water Conditioner 8.4oz
Fluval
AquaPlus Water Conditioner 8.4oz
$6.49 $6.49

Midnight Pearl Bio-Substrate (5lbs)
Aqua Natural
Midnight Pearl Bio-Substrate (5lbs)
$12.99 $12.99

Delta Sand Bio-Substrate (5lbs)
Aqua Natural
Delta Sand Bio-Substrate (5lbs)
$12.99 $12.99

Anubias Nana Long Wavy on Driftwood - Live Freshwater Plant
AquaZen
Anubias Nana Long Wavy on Driftwood - Live Freshwater Plant
$34.99 $34.99

Pest Snail Catcher & Remover
AquaZen
Pest Snail Catcher & Remover
$20.00 $20.00

Stainless Steel Straight Fine Tip Pinsettes
Ultum Nature Systems
Stainless Steel Straight Fine Tip Pinsettes
From: $29.99

Choose Options
Super Naturals Substrate - Gemstone Creek
CaribSea
Super Naturals Substrate - Gemstone Creek
Rating:
100%
1 Review
From: $13.32

Choose Options
Waste Control Biological Aquarium Cleaner 8.4oz
Fluval
Waste Control Biological Aquarium Cleaner 8.4oz
$15.99 $15.99

Login and Registration Form

  • Login
  • Register

Registered Customers
If you have an account, sign in with your email address.
Forgot Your Password?
or

Login with Your Social Profile Login with

Personal Information
Sign-in Information
Password Strength: No Password
Back
or

Login with Your Social Profile Login with
  • Forgot Your Password?

Please enter your email address below to receive a password reset link.
Go back