Big patch of white discolouration at dorsal fin base

Ash1176

I’m wondering what might be wrong with my German blue ram.
Tank is about a month and half old, fishless cycle, fish added this weekend.
Ph 6.8, ammonia 0, nitrite 0, nitrate 20ppm
Temp: 80, 20 gallon high
Just noticed this tonight, his dorsal fin is really folded or gone, and there’s a big white patch on both sides. Fish looked perfectly fine this morning. Is it fin rot ? Looks like it’s kind of dry, there is also a bit of white on the left fin.
Lost 2 cardinal tetras over the last few days, also got them this weekend.
Any help would be appreciated
 

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kallililly1973

Welcome here. Not an illness pro but looks like columnaris and appears all your fish may have been infected by it seeing your losing fish.
 

Ash1176

Thanks for the fast reply, yep looking at the description “The disease in the past has been called Saddleback Disease because often the afflicted fish will show a pale saddle like area across their dorsal finonto their back” that pretty much fits the bill.
will try and find API Furan-2 or Tetra Fungus Guard or Jungle Fungus Clear tabs tomorrow
 

Ash1176

sadly the ram passed overnight...
I’m on the fence about treating the rest of the fish in the tank, they don’t show any signs of Columnis as of yet, but I understand it can spread, Would exposing the healthy fish to the meds outweigh waiting to see if any other fish get the disease ?
 

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