Broad-spectrum antibiotic for the treatment of body fungus, fin and tail rot, popeye, gill disease, secondary infections and other gram-positive bacterial infections and fungal diseases. Maracyn Powder Freshwater is fast-dissolving and quick-acting antibiotic erythromycin powder that does not color aquarium water nor interfere with the biological filter. When used at the recommended dosage, Maracyn maintains a therapeutic level of the drug within the aquarium. 1 packet per 10 gallons of freshwater. Mardel Maracyn is recommended for the treatment and control of body fungus, columnaris, fin and tail rot, popeye and gill diseases in tetras, cichlids, livebearers, catfish and goldfish caused by Flavobacterium columnare, Haemophllus piscium, Aeromonas punctata, Aeromonas hydrophila and Cytophaga aquatilis bacteria. Residents of Florida, please ask your veterinarian for a prescription. Shop all Aquarium Medications. Please click on "More Information" for directions for use. | ||||||















