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

Fritz Maracyn Two Bacteria Medication

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Bacterial medication for freshwater and saltwater aquariums.

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Provides relief from bacterial infections such as fin and tail rot, popeye, and dropsy in fresh and saltwater aquariums.

Fritz Maracyn Two powder is a broad-spectrum antibiotic (minocycline) developed for use in aquariums. Due to its unique properties, it is absorbed by the fish through the skin. During the prescribed treatment, the concentration of minocycline in the fish fluids rises to a therapeutic level and is available to fight systemic infections susceptible to its action. It is primarily effective against gram-negative pathogenic organisms. Internal diseases are more difficult to detect than external ones and early detection is almost impossible. Symptoms of clamped fins, general listlessness, not eating, or other unusual behavior can be caused by internal infections. All suspected bacterial infections should be treated immediately.

Fritz Maracyn Two is non-toxic to invertebrates.



  • First day: Add the contents of two packets per 10 gallons of water.
  • Second through the fifth day: Add one packet per 10 gallons of water
  • Repeat this five-day treatment once if needed.

Cloudiness may occur while using Maracyn Two.


Important: Treat for five days even if visible signs disappear. May be used concurrently with Fritz Coppersafe, Maracyn, or Maracyn Oxy. Maracyn Two will not harm invertebrates.

​​​​​​​Maracyn Two 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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