Fritz Aquatics Mardel Maracyn Two Antibacterial Aquarium Medication

By Fritz Aquatics
Rated 5 out of 5 stars
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$21.48Chewy Price
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$24.99Chewy Price
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About This Item

  • Treats body fungus “columnaris”, fin and tail rot, popeye, dropsy, septicemia and gill disease in freshwater and saltwater fish.
  • Formulated with maracyn-two, a broad-spectrum antibiotic that is absorbed by the fish through the skin to enhance effectiveness.
  • Easy-to-use powder formula dissolves fast to start treating symptoms like clamped fins, swollen eyes, corner hiding and others.
  • Safe to use around invertebrates including shrimp, and is ideal for tetras, cichlids, catfish, goldfish, angelfish, clownfish, damsels and more.
  • Available in 8-pack and 24-pack boxes to accommodate any size tanks.

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Top IngredientsN/AN/AN/AN/AN/A
Fish TypeTropical Freshwater, Marine Fish, Goldfish, BettaTropical Freshwater, Betta, Cichlid...Tropical Freshwater, Betta, Cichlid, Goldfish, Bottom FeederTropical Freshwater, Goldfish, Cichlid, Bottom FeederMarine Fish, Marine Invertebrate
Aquarium TypeFreshwater, SaltwaterFreshwater, SaltwaterFreshwaterFreshwaterSaltwater

Questions & Answers

2 Customer Questions


Does this contain erithromycin? What are the active ingredients?
Answer by ChewyFeb 11, 2022
This medication does not contain erythromycin. The active ingredient is Minocycline.

Can you use for a Betta in a tank with no filter/circulation?
Answer by ChewyMar 30, 2022
This medication is safe to use with bettas. Maracyn may cause excessive cloudiness and foam production so it is recommended to remove carbon during treatment, but maintain adequate water flow or aeration.

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1 Customer Reviews



Rated 5 out of 5 stars
By Finnedfriend on Nov 3, 2021

Lifesaver for Goldfish

My fan-tail goldfish suffered from fin rot for 8 long months. I tried 3 other highly-recommended medications and kept the water pristine, all to no avail. Her fins continued to deteriorate. I finally tried one course of Maracyn Two and within a week her fins showed new growth! They are completely grown in now and she looks beautiful and healthy again.