Found this online.
Don't know if it's possible for you but the person said he used it for goldies
--Depending on what your sickness is you may vary the antibiotic, but I have had great success mixing antibiotics with cooked peas, yam meat, and an equal part cooked shrimp or salmon.
Put the whole batch including the antibiotic in the blender, or if you want after you roll the mixture into little balls, careful make a little hole to fill with antibiotic and roll it closed.
These are like moist pellets and the fishy smell is attractive to goldfish. You need to do some calculations but for human antibiotics or Maracyn the dosage is 10 mg/food ball. For Furan-2 which is what you probably need, the dosage should be 5 mg (per food ball).
Generally figure the oral dose should be 1/10 as much as you would put in 10 gallons water for a 4-5 inch fish.--