100%


Wow...you do use a
chlorine conditioner

Check your water parameters regularly!!! Some meds can interfere with the bacteria in the filter. If he seems a bit more active....leave thank alone....too many worries and adjustments on your part can add a lot of stress to the fish....watch him and let him heal....it won't be overnight.
Charcoal will filter out some of the meds. I don't use it ever, but some folks do. Don't worry about the water color yet....it's the fish you want to save.
Now, you have added salt and removed it, Fungus meds and removed it and now melafix.
Please relax and stop throwing fix things into your water...lol
No meds will heal him instantly. All these chemicals are not always the best thing!!..You are up to 3 now, and a 100% water change!!! ...please slow down and try not to panic.
Trust me, Ive been there before as most of us on the Forum have...healthy fish can heal...stressed fish will not.