Ooh I'm not sure actually. Our bird was hand raised by Dp, we had another given to us as a baby but it was just before Mitch was born so it didn't get enough attention when it needed, and it was always a little nutty.

I think my Bubba was lonely by himself though so that's why I'd say to give it a friend. Maybe it would be better to give him one and then decide if he wants to add to the cage?
Bubba had an awful lot of attention before the babies were born and he was such a huge part of the family. He used to fly around the house and try and impress the ladies by sitting on their shoulders and whispering in their ears, he loved to share a cup of tea and if you weren't careful he would fly to the edge of your plate and help himself to your spagetti! Oh and he used to wolf-whistle at me every morning .