Hello, My girlfriend has a community tank with a few female betta, harlequin rasboras, and one bristlenose pleco. All the water parameters are fine and the tank has been up and running for over a year (with its current inhabitants minus the pleco there for almost one year at this point). About one week ago, we noticed that one of the female bettas was swimming almost vertically (it looked like her tail end had a weight attached to it). We separated the girl out into a separate tank and lowered the water level so it would be easier for the fish to reach the top. We thought this was a swim bladder problem due to over eating (she was looking pretty round). So we fasted her for a few days, then fed her bits of pea (which she ate hungrily). But her problem still hasn't improved at all really. We also gave her a round of triple sulfa, but that has made no difference either. She is still in a tank by herself and getting fed very small portions. What should we do next? Any idea what this could be if not overeating or a bacterial infection of some sort? Thanks!