Sometimes, because of their shape, the internal organs push against the swim bladder. If that's the case with yours there isn't much you can do to right it. I imagine it gets worse as the fishes shape changes while growing. But don't lose hope! I actually just came across this article and it really made me happy. It's about a person with an oranda with really bad swim bladder issues: thedesignspace.net/MT2archives/000129.html