I have 3 sterlets and 2 diamond sturgeons, each about 5-6", in an unheated 240 with white clouds, bloodfins and Odessa barbs. I plan to add dojos and hi-fin banded sharks as well. Temp ranges from 50-65 F. I feed frozen brine, mysis, bloodworms and very small sinking pellets. They are very primitive, mild-mannered, non-aggressive and fascinating bottom feeders. I've had them for about 3 months and while they do get large they grow slowly. I will eventually move them into my 1,000 gal and then into a farm pond (if I'm still alive by then). I bought them online from a fellow on Aquabid who offers them regularly. They shipped well, were healthy and acclimated quickly.