Fish On The Way Out. Need Advice.

I had another post on this earlier but I got no responses on my update. I woke up early this morning to see my dwarf gourami acting funny. It ended up having something growing on it and now that it’s almost dead and fully developed I was wondering if anyone could tell me what this is? I put the fish in QT but I had to take it out of the main tank. Does this look more like dwarf gourami disease, a fungus, or Columnaris? I would like to know if I should dose the tank it came from with something or if it’s dwarf gourami disease and it should be fine. Everything looks fine from the tank it was in and the gourami went from looking perfectly fine yesterday to being in this condition. Thank you in advance for the advice.

 

I have a feeling that it's something along the lines of velvet, A201 do you second that?

 

I agree with nikm128

 

Please put it out of its missery

 

I have lost two DG so I am not getting anymore...