Here are one of my sterlets and a diamond. They were +-5" 3 months ago.
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they just get to big, i'd love to have one but i'd have to get an extremely massive tank which i may never have, my largest tank is a 125 gallon tank and that isn't even sorta big enough
It really depends on the species of sturgeon, the biggest get to be in excess of 12' and one stays less than 12" , a shovelnose sturgeon or a sterlet are good choices, they stay smaller and can easily be kept in a 125.
Please stop giving bad advice to peopel here