Ok this is really weird. Cas was completely fine a couple days ago. Then she started acting a little off, swimming a bit funny, laying on her side to sleep. I did a WC as I hadn't done one in a while -[) and waited to see what would happen. Yesterday I thought her fins looked a bit ragged but I decided to wait another day to be sure. Today I get up and her tail is completely split in half. But aside from that she looks terrible. She's lost all her color and her fins aren't clamped but held quite limply, and the tail looks like it's split in a few other places beside the main one. Also she looks to me like she's losing weight. Now I've seen enough sick fish to think this is not an ordinary case of finrot, and it needs to be treated aggressively... The problem is she's in a divided tank with another Betta, and I can't put her in the q tank cause there's already a fish in there. So, I need a med that's at the same time strong enough to stop her finrot & whatever else is going on, but not going harm Fuego who seems perfectly healthy.