Just lost one of the nicest bettas I have ever owned right out of the blue.
He got badly mauled by my sorority when the breeders' net he was in for a couple days (was making space in my barracks for him) fell into their tank. This was maybe 3-4 weeks ago now.
He battled through having all his fins torn off and was starting to regrow and was perfectly fine, flaring and eating. Yesterday he was a bit lethargic and today I went down and he was lying dead on the bottom.
I still have his genes in the form of a sibling female but he was just so gorgeous it is such a shame. Hopefully one day I can find another male as nice as he was.