Fritz Aquatics

Mardel Maracyn Two Bacterial Fish Treatment

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Highly effective for common bacterial infections in fish

Mardel Maracyn Two powder is a minocycline-based antibiotic medication which has been shown to be effective against a number of pathogenic bacteria associated with ornamental fish disease. Minocycline is a broad-spectrum antibiotic which is easily absorbed by fish directly through the skin. Maracyn Two is primarily effective against gram-negative pathogenic bacteria which are often associated with internal infections such as dropsy and popeye. Symptoms of clamped fins, swollen eyes or body, labored 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



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

  • Add the contents of two packets per 10 gallons of water.
  • Second through fifth day,  add one packet per 10 gallons of water every 24 hours.
  • Repeat this 5 day treatment only once if needed.


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



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