I think my oto catfish is having a SBD problem. Last time I saw it was last night at like 1 AM and it was fine. This afternoon I came home to a swollen little belly, normal coloring, and on it's side barely swimming around. I isolated it from the tank, and it didn't even freak out when it was in the net. It's still alive, but I don't see it's little underside moving like it should. Anything I can do to help it?