I'm new here, and although I have been following the forum for a while, it's my first post.
I have a problem with my Betta splendens fish, it seems like it is losing its scales and turns white in that area. About a week ago he was quite passive for a few days, lingering for hours on the bottom or top of the tank.
Since then his condition seemed to improve but since two days I spot these white marks and it started losing scales yesterday.
What can it be, and what can I do to make him better, any ideas? A picture is included in attachment.
Water quality is good and the other fish (14 neon tetras, 7 rasbora, 7 shrimps) are fine.
Thanks in advance.