Adding antibiotics to food, as most people do it, won't work unless by pure chance. The issue is that Kanamycin needs to be dosed at the proper rate - in this case, 50mg per kg of fish weight. Adding some Kanamycin to the food and then feeding some of that to the fish give a completely uncontrolled dose. We have a medicated food calculator here, but it is complicated....but this is a case where it must be complicated because of all of the variables that need to be controlled.
The Seachem web site doesn't explain it very well. Even if the dose in the food is known (what is a "scoop"?) there is no indication of how much to feed the fish. Feed the fish 1 gram of food or 2 grams of food DOUBLES the amount of drug the fish gets.
Here is my article on medicated foods:
Proper Dosing of Medicated Foods Jay Hemdal c. 2020 Oral medications are an excellent way to target internal diseases of fishes. Marine fish absorb aquarium water, so in certain cases, they “drink” enough medication from the water to effect a cure. However, freshwater fish actively export...
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Here is the med food calculator:
If you follow threads on the Fish Disease Treatment and Diagnosis forum, you know that whenever oral medication is the recommended treatment, @Jay Hemdal cautions that achieving the proper dosage is critical to success. He often refers to his article Proper Dosing of Medicated Foods. That...
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Jay