My Goodness that looks bad,what in the world is going on in your tank?
I hate to give up on an ailing fish but that infection damage looks like it is too far gone.
I'll actually give 2 or 3 more days probably though, then the melafix treatment should be done
Hello; I join the others that say put the fish down. Do it now, not tomorrow. Do not further prolong the suffering.K, tomorrow I am taking photos to a local trustworthy fish store, and I believe they are going to say the same thing as you, then I will buy clove oil or something, God I feel so bad