Did water change today, fish hasn't got any worse, all other fish are fine. I'm hoping for the best. I have read and talked to numerous people that have been through this and it went away. finger crossed
One suggestion - since stress in fish seems to be part of immunity - maybe stop doing water changes - and just observe? I mean - Im not an expert - but everything you do may stress the fish out more - unless there is a reason(chemical) to do a water change - that may be stressing them out more (than not doing one). JMHO

