I have a 300 gallon rubbermaid stock tank in my basement with just one 300watt heater and it stays at 80. let me know if you have questions about setting it up. Im not sure putting a sturgeon in it is a good idea they will eventually need more room I have a small Siberian in a tank now and they really need a lot of room to swim around he will need his own specially built pond. I also have videos of my pond in some of my threads if you want to check them out for ideas.