Not sure what disease I am treating here

[SandstoneSturgeon]

Can you help me identify if this is fungal or bacterial?


started about two weeks ago and is quickly moving to the entire tank. I tried to quarantine the “patient zero” fish (second photo) but it seems I couldn’t catch it fast enough.


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[PARAGUAY]

Did you test the water two weeks ago ammonia nitrite ? Have you maybe overfed the fish, a dead fish undetected, ?without water changes? We're the fish showing signs of parasites , could have secondary infections now as well. Several small water changes daily ,clean the filter , And something like esha 2000 and esha exit . Follow instructions and ensure no activated carbon in filter while under treatment.