i just bought a 2 1/2 inch ornate bichir 2 days ago and when i bought him he was under fed. His head was porpotioned to his body because of it. When he swims its not in a nice steady stride like my senegal, but when he swims it seems like his head wobbles a little. There arent any visual signs of damage, but could this be a broken spine or will he swim right when he puts on weight?