The two i bought were from local people not wanting them anymore. I can't help you here.
When I started liking for one I was told to go to a show. That way you can see and hold it and figure out what kind of temperament your getting.
The first one I bought was the Biak(known for binging more nippy) said to have never bitten him or strike at him. Before I got it set up at home it was striking. I thought maybe it was just stressed and left it alone but it never changed. I worked with it but it remained very cage defensive until it suddenly died. I'm much happier with my Aru. He has been a joy. Displays well, fun to watch at night, and fun to handle.