White sturgeon are pretty much an exclusively cold water fish. I think 80 would be a stretch. If you can lower your tank to the mid to low 70's even tropical fish don't need 80 degree water. tropicals are supposed to be ok from 68 up. Its a steady temps with no quick changes that is important not constant hight temps. When I keep my tropicals in my ponds i often leave them out until the water drops to 66 to 68 they do quite well. I wouldn't leave them at that temp for long periods but mid to low 70s is fine for tropicals. I often allow my tropicals to summer over in my ponds, from April to late October, early November ( I live in the deep south, and use heaters in my ponds) I give my fish summer vacation from their tank! Fish that are kept in cooler water live longer healthier lives.