My betta, Kalic, has been lathargic lately and not really eating. He sticks mostly to the top of the tank, and looks like he has trouble swimming down, and it looks like he floats back up, but will still go hide in his jar on the bottom. He doesn't have clamped fins, he is making bubbles, but not many and not enough for a good nest. I thought he might just be bored. I put him in a clear cup and set it in my tank with my female bettas to see if he would cheer up. He flared for second, stopped, flared again, then did nothing. I don't see any spots on him, or gold dust when I shine a light on him. Could it maybe be swim bladder, or something else?