My little Aussie is now about 6 months old. We have been getting along really well, and we have grown a very good bond together (although he/she doesn't like my partner very much


I try and spend as much time as possible with Aussie, and always let him out of his cage for an hour in the morning, and about 4-5 hours at night. I open his cage and he goes up top onto the perch, then when he is ready for a wander, he will sqaurk for me to pick him up (the last couple of days not as much and when I do come near him/her, it goes to bite me and lunge...)
I work all day and am gone from 8-6 everyday, but as I said, I let him out for long periods of time.
I'm considering getting another IRN and a larger cage for it/them. Will getting another bird help him? Make him happier?
Someone said that I would lose the bond with him though, is this true? Can't I have a good bond with both of them?
If I was to get another bird, should it be an IRN or another breed? I don't want to breed them, so will need to get the same sex bird????

Also, what size cage is best suited to 1 or 2 birds?
All knowledge is greatly appreciated!!
Thanks!!!