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Fritz Aquatics

Mardel Maracyn Bacterial Fish Treatment

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Highly effective for common bacterial infections in fish

Mardel Maracyn is a specially compounded, erythromycin-based antibiotic medication which has been shown to be effective against a number of pathogenic bacteria associated with ornamental fish disease. Erythromycin is a broad-spectrum antibiotic and is primarily effective against gram-positive pathogenic organisms. Almost all nitrifying bacteria are gram-negative, so the beneficial biological filter should not be harmed by treatment with Maracyn, and you shouldn't see a spike in ammonia or nitrite. Symptoms of clamped fins, swollen eyes, heavy or rapid breathing, patchy coloration, change in swimming behavior or corner-hiding can be signs of possible bacterial infection and may indicate a need for immediate treatment.

 

Available in Two Sizes

  • 8 count
  • 24 count

 

Fritz Mardel Maracyn can be used to treat fish suffering from common bacterial infections. Signs of infection can include the following: clamped fins, swollen eyes, heavy or rapid breathing, patchy coloration, change in swimming behavior.

 

Directions

Maracyn may cause excessive foam production in protein skimmers. Stop use of skimmer during treatment if excessive foaming is a concern.

  • Add the contents of one package per 10 gallons of water and repeat every 24 hours for 5 days.
  • Repeat this 5 day treatment only once if needed.

 

Important Note: Treat for 5 days even if visible signs disappear. Maracyn may be used concurrently with Coppersafe, Maracyn Two or Maracyn Oxy. Maracyn will not harm invertebrates. Consult a veterinarian or fish expert for assistance in diagnosis of disease causing organisms and treatment options.

 

More Information
SKU Mardel Maracyn Bacterial Fish Treatment - Fritz Aquatics
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Product Questions

If the instructions say 1 package per 10 gallons, does that mean it must be dosed in a hospital tank? My reef tank is 240 gallons. My hospital tank is 30 gallons. Should I fill 2/3 and use two packages to get the right dose?
Question by: Steven G on Jan 14, 2022, 10:11 AM
I do not recommend dosing a display aquarium for treatment. A quarantine system is best used for treating any disease. You can utilize your hospital tank with filtration(only biological and mechanical) and water changes as needed. You may want to also consider dosing the hospital tank with a bacterial supplement as well to help complete the nitrogen cycle and limit Ammonia spikes from an incomplete nitrogen cycle. If you are only filling the 30 gallon aquarium 2/3 full or 20 gallons then 2 packages should be the adequate dose initially. Be sure to follow the instructions for continued dosing to ensure proper treatment.

Directions for reference:

Add the contents of one package per 10 gallons of water and repeat every 24 hours for 5 days.
Repeat this 5 day treatment only once if needed.

Here are a few links to information on Quarantine setup:

https://www.bulkreefsupply.com/content/post/beginners-guide-how-to-build-a-quarantine-tank-ep32b

https://www.bulkreefsupply.com/content/post/md-2020-05-how-to-setup-a-quarantine-tank

https://www.bulkreefsupply.com/content/post/how-to-quarantine-fish-successfully-beginners-guide-ep-35
Answer by: Rick Pucciarella (BRS Staff) on Jan 14, 2022, 10:40 AM