Oh, most of the info I have learned has been on here, and just messing around looking stuff up on the internet when I am bored. I like to know what's going on and how to fix it before it happens haha!
Melafix sounds good, but that will usually only get the outside stuff, but I have seen it recommended to soak their food in it too, which would make it pass thru them.
I would keep up the water changes, but if your parameters are good, I would just do like 20% every other day or so.
My pic is the mouth of a lingcod my husband caught in Alaska.