Fritz Maracyn

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  • Treats bacterial infections
  • Safe for aquarium plants
  • Safe for shrimp, snails, and other invertebrates

Fritz 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.

For the 10-count and 20-count boxes of Maracyn, the medication comes in individual packets where each packet treats 10 gallons of water. The 100-gram bulk container treats a total of 1,000 gallons of water while the 400-gram bulk container treats 4,700 gallons of water, and both containers come with a scoop for easy dosing. When treating with Maracyn, we recommend using an air stone in the aquarium, which may temporarily cause excessive foaming at the water surface.

Customer Reviews

Based on 561 reviews
94%
(525)
3%
(16)
1%
(8)
1%
(3)
2%
(9)
K
Kelly H. (Savannah, GA, US)
Seems better

I medicated my tank according to directions and my fish seem better. Thank you so much for the quick turn time!

C
CHRISTOPHER C. (Marietta, GA, US)
Maracyn

Works as stated for Finn rot

k
kona a. (Kailua-Kona, HI, US)
One of my favorite meds

It’s helped me save fish time and time again love that you can get it in a small amount or a breeder size

L
Linda P. (Hayden, ID, US)

Fritz Maracyn

K
Kim
Quick shipping

Item name quickly. Needed meds ASAP for sick fish