Sorry to hear about your fish.
Sometimes no matter what one does it's still not enough to save the fish. With cases such as this one it's almost impossible to know exactly what's going on inside the fish, or exactly what the best course of action should be. I still think that it was a tumor, in which case the end result was going to come to this no matter what you did.
You gave it a great effort, more than most people would, sorry that it didn't work out.
Sometimes no matter what one does it's still not enough to save the fish. With cases such as this one it's almost impossible to know exactly what's going on inside the fish, or exactly what the best course of action should be. I still think that it was a tumor, in which case the end result was going to come to this no matter what you did.
You gave it a great effort, more than most people would, sorry that it didn't work out.