It sounds/looks like maybe a secondary bacterial infection... very common with parasites. The picture is hard to see him well, if you can get a closer picture of the entire fish... maybe clean the glass a little first.
I’m not trying to be picky, just want to be sure I’m giving the best advice. I know clear pictures are sometimes easier said than done
I’m not trying to be picky, just want to be sure I’m giving the best advice. I know clear pictures are sometimes easier said than done