At temps of 82'F columnaris is most virulent.
Back in the 50s and 60s it was commonly called live bearer disease, because it was time whether lots of live bearer hybridization, although it can infect all fish.
It seems with the invention of the flower horn, it switched over to become commonly know as flower horn disease, and in using an excess of antibiotics to keep the hybrids alive super bugs were developed.
Once the disease has got to the point the jaw and face have atrophied I have not had success in treating it, only if it is caught at the onset does it have a chance of erradification.
For me, I usually euthanize, if I notice its it doesn't infect other tanks.
I would tear down the tank, sanitize it and everything in it that touched water, with chlorine and start over.
The bacteria can lie dormant in a smudge of dirt or sand, and eventually reinfect.
Here is a profession, the fish died in only a few days.
It started with the fish hovering, increasing in color, but not eating.
The bacteria is gram negative, and an antibiotic that treats that type is needed
