Dwarf Gourami lip sore

[CDREMY]

Has a cream color sore on its mouth. Not sure what it is and what action I should take

 

[Fishmanic]

can you please post a pic or two

 

[CDREMY]

To late, I found him deceased this morning

 

[JuiceBox52]

Oh no!

 

[Fishmanic]

Maybe it was columnaris... a deadly disease.
Any other tankmates? They could get infected too.