Melafix is not good on a internal bacteria infection.
Melafix is a external med not internal.
Melafix is only good on cuts and wounds.
If in the uk you need anti internal bacteria med by interpet.
Your fish have septicemia which is very hard to cure once it advanced.
Septicemia is caused by dirty tank water, or bad water quality, or it enters the fish blood stream through cuts and wounds.
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