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  • Fritz Aquatics Fritz Maracyn Bacteria Medication
  • Fritz Aquatics Fritz Maracyn Bacteria Medication

Fritz Maracyn Bacteria Medication

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Bacterial medication for freshwater and saltwater aquariums.

In stock

Provides relief from bacterial infections such as body fungus, gill disease, and popeye in fresh and saltwater aquariums.

Fritz Maracyn is a specially compounded broad-spectrum antibiotic (erythromycin) that has been shown to be effective against a number of pathogenic bacteria associated with ornamental fish disease. It was developed for complete but gradual dissolution in water. It is primarily effective against gram-positive pathogenic organisms. 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.

All suspected bacterial infections should be treated immediately.

Fritz Maracyn is non-toxic to invertebrates. Follow dosage directions as detailed on the product packaging.



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.



Treat for 5 days even if visible signs disappear. Maracyn may be used concurrently with Coppersafe, MaracynTwo, or Maracyn Oxy. Maracyn will not harm invertebrates. Maracyn may cause excessive foam production in protein skimmers. Stop the use of a skimmer during treatment if excessive foaming is a concern.


NOTE: Consult a veterinarian or fish expert for assistance in the diagnosis of disease-causing organisms and treatment options.

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