Tom is trying to help & has been with you throughout this whole ordeal. He didn't have to. I understand how you feel. I truly do. I have lost several fish to Hex throughout the years & have saved many. Sometimes with all the right information/treatment, things get worse. Based on the pictures, I would put him to sleep. You can google it for specific instructions but basically you put the fish to sleep using clove oil (emulsified) & then use vodka. It is the most HUMANE way of putting fish to sleep. Of course, this a PERSONAL choice. I remember when I first put down my fish, it was gut wrenching because I loved that particular fish. He was part of the family. What made me pull through is that I did everything reasonable to save it. You are a caring fishkeeper & have tried treating your fish. You win some, you lose some --you learn from your experience(s). Now if you want to continue the treatment follow Tom's advice, LARGE water changes, add aquarium salt, and keep the aquarium as clean as possible. And I too wonder about the water parameters. A large water change does not equate to good water parameters.
