I got my 2nd betta fish yesterday and was wondering what’s wrong with the top of his head? I’m adding tannins to his tank today to see if it helps but I’m wondering if anyone can tell me what that is and how I can fix it? I’ve never seen that in a betta before.
https://i.redd.it/99jepem52nmg1.jpeg
Posted by Altruistic-Turn2102