Fritz Maracyn – 10 Sachets

Fritz Maracyn® – Erythromycin Antibiotic Powder (10 Sachets)

Fritz Maracyn® is a specially formulated erythromycin-based antibiotic powder effective against gram‑positive bacterial infections in both freshwater and marine aquariums. Ideal for treating conditions such as body fungus, bacterial gill disease, popeye, open lesions, dropsy, and more—and it’s non-toxic to invertebrates.

Key Features & Benefits

• Broad-spectrum erythromycin (200 mg per sachet) targets gram‑positive pathogens
• Safe for use with shrimp, snails, corals, and plants
• Non-clouding, slow-dissolving formula keeps water stable
• Use alongside Maracyn® Two or Maracyn® Oxy for mixed infections

Directions & Dosage

• **Dosage:** Add one sachet per 10 US gal (38 L) of aquarium water once daily
• Continue for **5 consecutive days**, regardless of visible improvement
• On **Day 6**, perform a 25% water change; repeat the 5-day course if needed
• Use in a quarantine tank for best results
• Temporarily disable carbon filtration and protein skimmers if foaming occurs
• UV sterilizers may remain in operation
• Do **not** perform water changes during treatment; use ACCR or Complete if ammonia/nitrite arises
• Pictured dosage treats 100 US gal from 10 sachets

Product Details