FC, I have a fascination with sturgeon, too! My lab let me take a baby green sturgeon home a few years ago. Both those and white sturgeons get to HUGE lengths (like over 8 feet). Mine died after I used Rid-Ich (thus my recommendation for everyone to stay away from chemical ich treatments). But if it hadn't, there's no way I could have kept it. I would have had to give it back to my lab where they have huge, circular flow-through tanks to house adult sturgeon.
I have to agree with everyone else and say leave those to the professionals. I'm personally never going to try to house one again.
But sturgeon are on my list of favorite fish. They're VERY cool looking and are just unique in almost every way. Do you know that they're secondarily cartilaginous? Their ancestors had bone, but they lost it. They also have spiral valve intestintes like sharks and rays.