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Mardel Maracyn

$ 11.99
$ 11.99

Maracyn's active ingredient is Erythromycin. The savings come in the large 24 pack or larger over the traditional API Erythromycin. Each packet treats 10 gallons.

Don't confuse this with Maracyn 2, which isn't the same we don't currently carry.

Customer Reviews

Based on 4 reviews
Quicker than Amazon

The Maracyn worked as Cory said it would. In addition I ordered the liquid fertilizer he recommended. I just started using it so I do not have a review on it. I did note the liquid fertilizer was shipped in a sealed plastic bag so if it did leak it would be contained. One of those small attention to detail. The shipping was faster than Amazon to Hawaii.

Good Product Needs Better Directions

It works. Would like it if the manufacturer had directions for how to avoid aspirating the stuff.

Like maybe pour it into a container with a lid and some aquarium water and shake it up first, then pour it in the tank- cause just dumping it in sends some of it up into the air, and I don’t need the antibiotics, the fish do!

Just Exactly Perfect

Bought this to treat Cyanobacteria in my Dwarf Puffer tank. The recommended 5 doses demolished it.

Great product.

Ordered this to take care of a bacterial infection my poor fish had. Did't upset my cycle and all my fish are back to their healthy happy selves. The only fish that i lost sadly passed away before we got our shipment.

Shipping Rates
Flat rate shipping on order under $70 of $4.99
FREE Shipping over $70.

To view our shipping map and estimated delivery times click here.

Live Arrival Guarantee
We guarantee our live products will arrive alive. We ask that you do your part and minimize the amount of time our packages sit out in the elements. It can also be a good idea to avoid ordering live items during extreme temperatures. This would be when night time temps are below 35 and over 80 degrees during the day. Now these temps are not for sure death, it's just what makes it easiest for all of us during shipping.

When temperatures are cold we will use heat packs and extreme cold styrofoam liners. Shipping live goods is difficult as our warehouse could be 70 degrees and your home could be snowing, and all the stops in between. We do our best and will make it right for you and may request to try again at a different time.  During heat waves, it's best to avoid ordering live goods as ice packs etc don't do enough to mitigate it. 

30 Day Return Policy
Our goal is to provide a fair way to satisfy our customers and not lose money while doing it. We make every effort to fully disclose how our products work and what is to be expected. A damaged product during shipping is an automatic replacement from us. When it comes to a difference of opinion such as: "My fish doesn’t like this food." That we don’t refund for. However, if you decide the light you bought is a bit too green for your liking, provided it is in the original box, within 30 days and purchased from us, we will refund it at your cost of shipping.

If you would like to return a product, start the process by emailing us at shipping@aquariumcoop.com This allows us to see if there is something we can do before returning the product such as a feature you didn’t know about or send you a return label. We don’t require an RMA number, but do ask you to contact us to initiate the return. Please do not call the retail store as they operate separately from the warehouse and will not be able to issue you a return label etc.

To read our full return policy click here