Ok, i cleaned my water over the space of a day and started to treat with pimafix.
Im not sure what i should be treating for. Columnaris is apprently high contagious, yet the other gourami in the QT has no signs of anything wrong. No white spots or anything. The one that isnt well has like white patches and spots, raised maybe 1mm-2mm, not fluffy, just on the body and fins, not on the mouth.
What do you think i should do?