Keeping Sturgeon?

Have you ever kept a sturgeon? I know that's a bit of an unusual question, but for some reason, I really want to. LiveAquariua says they need a 180 Gallon tank, but I feel like that's cutting it short for a fish that could potentially reach 4 feet. What size tank would you recommend it be, post links, give dimensions, give # of gallons, anything helps. And, what might be some suitable tankmates? I currently have angelfish, would I be ale to keep those with the Sturgeon? I also remember reading somewhere that they should be kept in a pond at least four feet deep and something like 8 feet by 12 feet, or something like that. Sorry for all the questions, and thanks for any help.



In case you've never seen one: http://ift.tt/1upjnnL