To my surprise, the fuzz has fallen off the fish! Yeah!! Yesterday, at the end of the day, I used a swab to remove the fuzz off his body and fin the best I can. I also used a pair of clean shears (I dedicate one hair cutting shears just for fish use $1 at Dollar Tree) to snip his tail to remove part of fin that has fuzz on it. It wasn't easy. And swabbing him in shallow water was the only way to get him to stay still.
I've gone ahead and reduced salt by a teaspoon. And plan on reducing another teaspoon tomorrow. Hope that the fuzz won't return. I'll keep him on 1 teaspoon per gallon for another 6-7 days after that.
Here is what he looks like now: