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Mardel Maracyn Fish Medication

$11.95 - $21.95
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Free shippingFREE shipping on all orders over $50!(excluding orders of live fish)


Mardel Maracyn is for the treatment and control of body fungus "columnaris," fin and tail rot, popeye and gill disease in freshwater fish, including tetras, cichlids, livebearers, catfish and goldfish to mention just a few and many saltwater fish as well.  No water changes, pH, or temprature adjustements are necessary when treating the fish.  Mainatain normal filtration.  Maracyn will not harm invertebrates.  It comes in fast dissolving powder form. Each Maracyn packet contains 200mg erythromacin activity (same active ingredient that is found in API E.M. Erythromycin). 

Mardel Maracyn® is a specially compounded broad-spectrum antibiotic (erythromycin) which 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.


Add the contents of one packet per 10 gallon of water and repeat every 24 hours for 5 days.  Repeat this 5-day treatment only once if needed.  Important: treat for 5 days even if visible signs disapear.  May be used concurrently with Coppersafe, Maracide, maracyn Two or Maracyn Oxy.  


8 packets (0.6g)

24 packets (0.6g)