I seen the pic of your fella and he does have a pretty bad case of rot...do you have any tannins-from IAL, native oak leaf..even the blackwater extract they sell, or decaf green tea bags will work and pre-mix one of these in a 1g jug- steep for at least an hour, add the aquarium salt 1tsp/g, dechlorinator (shake well before use) use this pre-mixed treatment water for 100% daily water changes in a small QT container that you can float in a heated tank-76-77F for 10 days-this pre-mixed water will start to get dark amber in color the longer it steeps and releases the tannins-this is what you want...it can take at least a week to start to see any improvement and healing- soon you will see white to clear edges of re-growth-total regrowth can take months and you may have to repeat the 10 day treatment every month until he fully recovers-Feed a high protein diet too of live or frozen food-small amount several times a day but not so much the he bloats to encourage healing..
I personally don't use it and I too have read both good and bad-my understanding with this product is that it will not hurt the fish directly per se...but the fumes it emits can cause adverse effects on the labyrinth organ and best to keep the top open on the treatment container to limit the fumes and effect-but otherwise can be safe-Information that I read written by the maker also states that the product has limited effect on some bacteria-not all and so it is a crap shoot so to speak when you use it...a bit dependent on the pathogen that causes the illness in the first place.
Hey OFL..You posted on my thread -Betta took a Fall- and I was wondering if you have had any issues with using Melafix? I have read up on it and there are both good and bad things about it.. so I have been using it for treatment and have had no issues with it so far...But im wary...What is your input? Thanks CTL