I have a 29 gal
tank with 6 zebra danios, 5 dwarf neon raindbowfish, and 3 cory cats. Tank is not fully cycled (a Bio-Spira partial success, grrr), so ammonia fluctuates in the 0 - 0.25 ppm
range and nitrites about the same. Nitrates 5 ppm
or lower. pH 7.0-7.2, temp 76.
About a week ago all my rainbowfish developed mouth "fungus" (columnaris). I tried MelaFix and PimaFix for just a couple of days, but things seemed a bit worse so I figured I needed a real antibiotic. Went looking for Kanamycin, since that is recommended as a treatment, but couldn't find it anywhere. So I went out on a limb, got some Maracyn and Maracyn-II, and am now on day 5 of what is supposed to be a 5-day treatment with those. Unfortunately, they haven't helped. The cotton mouth on the rainbows has not gotten better (though it isn't really worse, either), however now at least one of the zebras has it, and one of the rainbows seems to have the early stages of fin rot--no physical damage to the fin yet, but a section of it is discolored from its normal red color to a faded, black color so I am guessing that is the problem.
Well today I finally went to my 4th fish store and found one that carries a Kanamycin antiobiotic. So I picked up two packets of capsules of Kanacyn by Aquatronics. However, the packaging only contains directions for dumping the capsules directly into the tank--yet I have read others say the best way to deliver Kanamycin is to soak food in it.
Does anyone know how to do this? (Or have any other suggestions)?