API E.M. Erythromycin


This is what we use here at the store and at Cory's fish room to treat every fish we come into contact with. For us we've never had problems using it with inverts, scaleless fish, and plants. We've never had our beneficial bacteria die from this medication, but as with all medications take precautions in case your cycle does crash. 

Commonly used to treat:

  • Cyanobacteria
  • Fin Rot & Tail Rot
  • Columnaris 
  • Open Wounds

Dosing Instructions:

For best results remove activate carbon. For each 10 gallons of water empty on packet directly into aquarium (For 850gm jar, add one scoop [1tsp] per 20 gallons), repeat dose after 24 hours then change 25% of the aquarium water. Repeat treatment a second time for a total of 4 doses, then make a 25% water change. Treatment may be repeated if necessary. Four doses required for full course treatment. 

Treats 100 Gallons. 10 Packets, each treating 10 gallons. 850gm container treats 3270 gallons.



Customer Reviews

Based on 46 reviews
Expensive, but well worth it!

This is my go to product for bacterial treatments. Not sure why API has switched to Furan-2 and others that do they same thing as EM but not as effectively. I bought the 850 gram container to be well stocked. Wish I could buy more, but cannot justify it to the lady of the house. Aquarium Co-op shipped it out quick even through all the BF/CM busy-ness.

It works

I use it and it works. Cory introduced me to it on YouTube and I only buy it from the coop. Great company great people.

Great price and fast shipping on something all fish keepers should have in the refrigerator.

Waiting for meds when your precious is sick sucks. Good prices let me keep a "safety net" in the fridge at all times.

Glad to be able to get it

I watch Corey's videos about quarantining new fish and wasn't able to source the Erythromycin on Amazon. Haven't used it yet. Grateful to be able to get it here. Fast shipping.

Great Customer Service

I use this medication in my quarantine program with all my fish I import in. This along with General Cure and Ich X works great. I always buy from Aquarium Co-Op because I know that I will always receive the best customer service and this time it there was no difference! Everything showed up in great shape and always sooner than I thought.

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