I have a juvenile Senegal Bichir (about 4in) that I have had less than a month. I have him in a 45gal tank with a Delhezi bichir of the same size. I was having trouble getting my Del to eat, and my Sen would end up eating his food AND half of hers. Now his back half is floating up awkwardly and he is having troubles swimming and keeps wedging himself under branches so he can lay flat. Is he just gassy?? I really hope he doesn't have swim bladder disease...