I assume the sturgeon will be moved to the 13000 gallon pond once he gets a bit bigger, right?
The sturgeons are just show fish for the tank at the moment
I have about 24-25 Celsius in my tank and they seem to do really good and have never shown any signs on that they dont like it.
When they reach about 90-95cm they will go in the 250 000 Gallon pond with other sturegons and I will get some new ones in this size