A little hard to see but this is the fish has what looks like a thin layer of fungus over her face and fins. I've quarantined her plus two other fish (one of whom since died). They all had fungus on their faces. Also on their saddle area. The quarantine tank is at a lower temp (24C), salt added and kanaplex treated. I've also added kanaplex to their food but 3 days later the fungus has spread rather than improved. Any idea if this could be something else other than columnnaris? Also, should I feed the kanaplex to my main tank as a preventative measure or wait in case I see more affected fish? Thanks in advance!