My tank recently had a small outbreak of columnaris (my fault since I didn't use a QT tank for new fish) The disease surprisingly and thankfully did not spread to any other fish that I know of except for the ones who already had it. I did not separate the sick because I assumed the water had already been infected and I should treat the whole tank for it rather than just the infected since all of the fish might have been exposed.

One of the infected died today and I didn't see it due to the plants and decorations until I noticed my pleco feasting upon one of the sick's body (which I removed prompty). Would this be worse than the normal symptoms of the outbreak, and would I need anything special for this? I've started treatment with Furan-2 already. Would this treatment still work if the fish ate the columnaris? Or would I now need something more ?

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    For reference, columnaris is commonly referred to as cottonmouth (because one symptom is white spots on the mouth).
    – Spidercat
    Commented Dec 14, 2015 at 18:04

1 Answer 1


After a lot of research, I have found that columnaris can manifest in an internal infection, so I should also treat with Kanamycin aka Kanaplex as well.



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