Pardon my ignorance! This is a pic of my Betta boy, who was attacked in a community tank. He is now in a 5 gal, with salt, colloidal silver and 1/2 dose of melafix. (He is also blind). (There was some ammonia in his tank yesterday, which I'd figured might have caused the rot).
I'd written yesterday about a mild case of fin rot. Now, I wonder if it is that, or actual regrowth?
Sorry...pic not the greatest. If there appears to be black at the bottom of the pelvic fins, it's due to the camera. His pelvic fins are jagged, but no discolouration.