I am in no way a fish expert and I've only dealt with fish sickness /one time/ but I really want to try to help.
I used "quick cure" which I understand is harsh on the fish, but it has formalin in it. The instructions read that it was to go in the water that the fish reside in (QT tank)... and it was for longer than 2 days. I'm not sure how your product is supposed to work.
Perhaps read the instructions or ask your LFS
.. or hopefully someone more intelligent will chime along.
I hesitate to give advice but I really don't want to see your fishes die
Perhaps for others reading you could post a picture of the fish. Then search google images for what looks like the same, and take in the picture to your LFS
to see what they have to say.
Really hoping you get this sorted before it is too late!