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API Erythyromycin vs. Fritz Maracyn Directions Discrepancy


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For each 10 gallons of water, empty one packet directly into aquarium. Repeat dose after 24 hours. Wait another 24 hours then change 25% of the aquarium water. Repeat this treatment for a second time, for a total of 4 doses. Then make a final 25% water change and add fresh activated carbon or replace filter cartridge.



Directions: One complete course of treatment will take 5 days.
Treat for the full course of treatment even if visible signs of infection or illness disappear.

Day One through Day Five: Each day add contents of one packet per 10 gallons of water to be treated.
Day Six: Perform a 25% water change. If Necessary, a second full course of treatment may be performed starting on Day Seven.

Any idea why there's a difference of treatment on these two?  I am planning to dose every day, but I was curious why the API one was different when I looked it up.  Lower stress on the fish I would imagine, but is there something I'm missing?

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On 8/13/2022 at 8:10 PM, Colu said:

If I remember rightly API erythromycin has 400mg of the active ingredient and maracyn has 200mg that could be why they have different dosing instructions

Yeah I checked that too!  Same levels.


Edited by nabokovfan87
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