Help cloudy white film on fish, they’re dying.

Mosko

I have a 75 gallon tank with
Tiger barbs
Denison barbs
Skirt tetras
Swordtails
Some rainbows
Blue Gouramis
Etc
There seems to be something killing my fish. Everyday or so, I notice like a cloudy white film developing on some of my fish. Sometimes it starts on the body, sometimes on the fins and sometimes by the mouth. And after a day or 2 the fish just die. I cannot figure out what it is. I will post a few pics.
 

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BOB4445

I'm not a expert but it kind of looks like columnaris
 

Mosko

I'm not a expert but it kind of looks like columnaris
Thanks. Just checked the symptoms and it seems to be the case. What would be my best treatment option for a planted tank?
 

BOB4445

Thanks. Just checked the symptoms and it seems to be the case. What would be my best treatment option for a planted tank?
I heard water changes can help but I used Fritz Maracyn - 8 Count but it would take like 5 boxes for a 75 gallon
 

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